How long will it take a certain sum of money triples itself at 13 1.3 per annum simple interest?

Chapter 9: Interest

Exercise 9 (A)Exercise 9 (B)Exercise 9 (C)

Selina solutions for Concise Mathematics Class 8 ICSE Chapter 9 Interest Exercise 9 (A) [Page 106]

Exercise 9 (A) | Q 1.1 | Page 106

Find the interest and the amount on:
₹ 750 in 3 years 4 months at 10% per annum.

Exercise 9 (A) | Q 1.2 | Page 106

Find the interest and the amount on:
₹ 5,000 at 8% per year from 23rd December 2011 to 29th July 2012.

Exercise 9 (A) | Q 1.3 | Page 106

Find the interest and the amount on:
₹ 2,600 in 2 years 3 months at 1% per month.

Exercise 9 (A) | Q 1.4 | Page 106

Find the interest and the amount on:
₹ 4,000 in `1 1/3` years at 2 paise per rupee per month.

Exercise 9 (A) | Q 2 | Page 106

Rohit borrowed Rs. 24,000 at 7.5 percent per year. How much money will he pay at the end of the 4th years to clear his debt?

Exercise 9 (A) | Q 3 | Page 106

The interest on a certain sum of money is Rs. 1,480 in 2 years and at 10 percent per year. Find the sum of money.

Exercise 9 (A) | Q 4 | Page 106

On what principal will the simple interest be Rs. 7,008 in 6 years 3 months at 5% per year?

Exercise 9 (A) | Q 5 | Page 106

Find the principal which will amount to Rs. 4,000 in 4 years at 6.25% Per annum.

Exercise 9 (A) | Q 6.1 | Page 106

At what rate per cent per annum will Rs. 630 produce an interest of Rs. 126 in 4 years ?

Exercise 9 (A) | Q 6.2 | Page 106

At what rate, percent per year will a sum double itself in `6 1/4` years?

Exercise 9 (A) | Q 7.1 | Page 106

In how many years will Rs.950 produce Rs.399 as a simple interest at 7%?

Exercise 9 (A) | Q 7.2 | Page 106

Find the time in which Rs.1200 will amount to Rs.1536 at 3.5% per year.

Exercise 9 (A) | Q 8 | Page 106

The simple interest on a certain sum of money is `3/8` of the sum in `6 1/4` years. Find the rate percent charged.

Exercise 9 (A) | Q 9 | Page 106

What sum of money borrowed on 24th May will amount to Rs.10210.20 on 17th October of the same year at 5 percent per annum simple interest.

Exercise 9 (A) | Q 10 | Page 106

In what time will the interest on a certain sum of money at 6% be `5/8` of itself?

Exercise 9 (A) | Q 11 | Page 106

Ashok lent out Rs.7000 at 6% and Rs.9500 at 5%. Find his total income from the interest in 3 years.

Exercise 9 (A) | Q 12 | Page 106

Raj borrows Rs.8,000; out of which Rs. 4500 at 5% and the remainder at 6%. Find the total interest paid by him in 4 years.

Exercise 9 (A) | Q 13 | Page 106

Mohan lends Rs.4800 to John for `4 1/2` years and Rs.2500 to Shy am for 6 years and receives a total sum of Rs.2196 as interest. Find the rate percent per annum, it being the same in both the cases.

Exercise 9 (A) | Q 14 | Page 106

John lent Rs. 2550 to Mohan at 7.5 percent per annum. If Mohan discharges the debt after 8 months by giving an old black and white television and Rs. 1422.50; find the price of the television.

Selina solutions for Concise Mathematics Class 8 ICSE Chapter 9 Interest Exercise 9 (B) [Page 108]

Exercise 9 (B) | Q 1 | Page 108

The interest on a certain sum of money is 0.24 times itself in 3 years. Find the rate of interest.

Exercise 9 (B) | Q 2 | Page 108

If ₹ 3,750 amount to ₹ 4,620 in 3 years at simple interest. Find:
(i) the rate of interest
(ii) the amount of Rs. 7,500 in `5 1/2` years at the same rate of interest

Exercise 9 (B) | Q 3 | Page 108

A sum of money, lent out at simple interest, doubles itself in 8 years. Find :
(i) the rate of interest
(ii) in how many years will the sum become triple (three times) of itself at the same rate percent?

Exercise 9 (B) | Q 4 | Page 108

Rupees 4000 amount to Rs.5000 in 8 years; in what time will Rs.2100 amount to Rs.2800 at the same rate?

Exercise 9 (B) | Q 5 | Page 108

What sum of money lent at 6.5% per annum will produce the same interest in 4 years as Rs.7500 produce in 6 years at 5% per annum?

Exercise 9 (B) | Q 6 | Page 108

A certain sum amounts to Rs.3825 in 4 years and to Rs.4050 in 6 years. Find the rate percent and the sum.

Exercise 9 (B) | Q 7 | Page 108

At what rate percent of simple interest will the interest on Rs.3750 be one-fifth of itself in 4 years? To what will it amount in 15 years?

Exercise 9 (B) | Q 8 | Page 108

On what date will ₹ 1950 lent on 5th January 2011 amount to ₹ 2125.50 at 5 percent per annum simple interest?

Exercise 9 (B) | Q 9 | Page 108

If the interest on Rs.2400 is more than the interest on Rs.2000 by Rs.60 in 3 years at the same rate percent; find the rate.

Exercise 9 (B) | Q 10 | Page 108

Divide Rs. 15,600 into two parts such that the interest on one at 5 percent for 5 years may be equal to that on the other at `4 1/2` percent for 6 years.

Selina solutions for Concise Mathematics Class 8 ICSE Chapter 9 Interest Exercise 9 (C) [Pages 114 - 115]

Exercise 9 (C) | Q 1 | Page 114

A sum of Rs. 8,000 is invested for 2 years at 10% per annum compound interest. Calculate:
(i) interest for the first year.
(ii) principal for the second year.
(iii) interest for the second year.
(iv) the final amount at the end of the second year
(v) compound interest earned in 2 years.

Exercise 9 (C) | Q 2 | Page 114

A man borrowed Rs. 20,000 for 2 years at 8% per year compound interest. Calculate :
(i) the interest of the first year.
(ii) the interest of the second year.
(iii) the final amount at the end of the second year.
(iv) the compound interest of two years.

Exercise 9 (C) | Q 3 | Page 114

Calculate the amount and the compound interest on Rs. 12,000 in 2 years and at 10% per year.

Exercise 9 (C) | Q 4 | Page 114

Calculate the amount and the compound interest on Rs. 10,000 in 3 years at 8% per annum.

Exercise 9 (C) | Q 5 | Page 114

Calculate the compound interest on Rs. 5,000 in 2 years; if the rates of interest for successive years be 10% and 12% respectively.

Exercise 9 (C) | Q 6 | Page 114

Calculate the compound interest on Rs. 15,000 in 3 years; if the rates of interest for successive years be 6%, 8%, and 10% respectively.

Exercise 9 (C) | Q 7 | Page 114

Mohan borrowed Rs. 16,000 for 3 years at 5% per annum compound interest. Calculate the amount that Mohan will pay at the end of 3 years.

Exercise 9 (C) | Q 8 | Page 114

Rekha borrowed Rs. 40,000 for 3 years at 10% per annum compound interest. Calculate the interest paid by her for the second year.

Exercise 9 (C) | Q 9 | Page 114

Calculate the compound interest for the second year on Rs. 15000 invested for 5 years at 6% per annum.

Exercise 9 (C) | Q 10 | Page 114

A man invests Rs. 9600 at 10% per annum compound interest for 3 years. Calculate :
(i) the interest for the first year.
(ii) the amount at the end of the first year.
(iii) the interest for the second year.
(iv) the interest for the third year. the interest for the first year.

Exercise 9 (C) | Q 11 | Page 114

A person invests Rs. 5,000 for two years at a certain rate of interest compounded annually. At the end of one year, this sum amounts to Rs. 5,600. Calculate :
(i) the rate of interest per year.
(ii) the amount at the end of the second year.

Exercise 9 (C) | Q 12 | Page 114

Calculate the difference between the compound interest and the simple interest on ₹ 7,500 in two years and at 8% per annum.

Exercise 9 (C) | Q 13 | Page 114

Calculate the difference between the compound interest and the simple interest on ₹ 8,000 in three years and at 10% per annum.

Exercise 9 (C) | Q 14 | Page 114

Rohit borrowed ₹ 40,000 for 2 years at 10% per annum C.I. and Manish borrowed the same sum for the same time at 10.5% per annum simple interest. Which of these two gets less interest and by how much?

Exercise 9 (C) | Q 15 | Page 114

Mr. Sharma borrowed ₹ 24,000 at 13% p.a. simple interest and an equal sum at 12% p.a. compound interest. Find the total interest earned by Mr. Sharma in 2 years.

Exercise 9 (C) | Q 16 | Page 114

Peter borrows ₹ 12,000 for 2 years at 10% p.a. compound interest. He repays ₹ 8,000 at the end of the first year. Find:
(i) the amount at the end of the first year, before making the repayment.
(ii) the amount at the end of the first year, after making the repayment.
(iii) the principal for the second year.
(iv) the amount to be paid at the end of the second year, to clear the account.

Exercise 9 (C) | Q 17 | Page 114

Gautam takes a loan of ₹ 16,000 for 2 years at 15% p.a. compound interest. He repays ₹ 9,000 at the end of the first year. How much must he pay at the end of the second year to clear the debt?

Exercise 9 (C) | Q 18 | Page 115

A certain sum of money invested for 5 years at 8% p.a. simple interest earns an interest of ₹ 12,000. Find:
(i) the sum of money.
(ii) the compound interest earned by this money in two years and at 10% p.a. compound interest.

Exercise 9 (C) | Q 19 | Page 115

Find the amount and the C.I. on ₹ 12,000 at 10% per annum compounded half-yearly.

Exercise 9 (C) | Q 20 | Page 115

Find the amount and the C.I. on ₹ 8,000 in `1 1/2` years at 20% per year compounded half-yearly.

Exercise 9 (C) | Q 21 | Page 115

Find the amount and the compound interest on ₹ 24,000 for 2 years at 10% per annum compounded yearly.

Exercise 9 (C) | Q 22 | Page 115

Find the amount and the compound interest on ₹ 16,000 for 3 years at 5% per annum compounded annually.

Exercise 9 (C) | Q 23 | Page 115

Find the amount and the compound interest on ₹ 20,000 for `1 1/2` years at 10% per annum compounded half-yearly.

Exercise 9 (C) | Q 24 | Page 115

Find the amount and the compound interest on ₹ 32,000 for 1 year at 20% per annum compounded half-yearly.

Exercise 9 (C) | Q 25 | Page 115

Find the amount and the compound interest on ₹ 4,000 in 2 years, if the rate of interest for the first year is 10% and for the second year is 15%.

Exercise 9 (C) | Q 26 | Page 115

Find the amount and the compound interest on ₹ 10,000 in 3 years, if the rates of interest for the successive years are 10%, 15%, and 20% respectively.

Chapter 9: Interest

Exercise 9 (A)Exercise 9 (B)Exercise 9 (C)

Selina solutions for Concise Mathematics Class 8 ICSE chapter 9 - Interest

Selina solutions for Concise Mathematics Class 8 ICSE chapter 9 (Interest) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Concise Mathematics Class 8 ICSE solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Concise Mathematics Class 8 ICSE chapter 9 Interest are Concept of Compound Interest, To Find the Principle (P); the Rate Percent (R) and the Time, Interest Compounded Half Yearly, Applications of Compound Interest Formula, Concept of Principal, Interest, Amount, and Simple Interest.

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Get the free view of chapter 9 Interest Class 8 extra questions for Concise Mathematics Class 8 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

How long will it take a certain sum of money to triple itself at 13 1/3 pet annum simple interest?

How long it will take a certain sum of money to triple itself?

How long will it take a certain sum of money to triple itself at 10% per annum simple interest?

How long does it take for a sum of money to triple itself at a simple interest rate of 5% per annum?