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Important Questions on Practice SetThe ratio of the ages of Ajay and Vijay is 3: 4. After 5 years, the new ratio of their ages will be 4: 5. What is the age of Vijay at present? Mohan bought 20 dining tables for Rs 12000 and sold them at a profit to the cost price of 4 dining tables. The selling price of each dining table is: Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series: AZ, GT, MN, ?, YB 3D Learning Videos on Topics related to Practice SetScattering of LightWhen a beam of sunlight enters a dark room through a small hole, its path becomes visible. Wonder why this happens? Let’s find out in this video. Physical Properties and Uses of Noble GasesThe noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons.... Metallic ConductorsElectrical conductance through metals is called metallic or electronic conductance and is due to the movement of electrons. Let’s learn how it takes place, t... Questions featured in Previous Year Papers on Practice SetA man walking at the rate of 5 km/hr crosses a bridge in 15 minute. The length of bridge (in meters) is: Enrich your Learning with Real Life Examples and DIY VideosVolume of ObjectsA boy slept on a couch, leaving a pile of biscuits on the table. Let's find out how two mice amazingly stole his pile of biscuits by explaining the volume of... Method to Easily Get Square RootsBuckle up and get your noggin ready! Let's discover how we can take the square root of a big number easier in only two minutes tops! Hop into this video and... Graph of a Linear Equation in Two VariablesWhat would the graph of the linear equation in two variables be? What would its shape be? Would there be any x-axis intersection? Watch this video to learn m...
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How long will it take for an amount to become double of itself at 4% per annum simple interest?=(x×4100×x)years = 25 years.
At what sum doubles itself in 8 years 4 months?So, rate of interest at which a sum doubles itself in 8 year 4 months is 12%.
At what rate of compound interest does a sum of money becomes 4 times of itself in 4 years?∴ Rate %=41.42% half yearly and 82.84% p.a.
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