A sum of money becomes four times of itself in 12 years. Find the rate percent per annum.

Let the sum = Rs. 100 then amount = Rs. 400 then S.I = Rs. 300 = PRT/100 or rate of interest(R) = 300 ×100 /(P×T) = 300 × 100 / ( 100 × 12) = 25%

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- A man invested a certain amount of sum at 11% per annum simple interest and earned an interest of Rs. 2200 after 2 years. If the same amount is invested at 25% per annum compound interest, compounded annually for two years then the interest would be:
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- A farmer wants to divide Rs 1,22,000 between his sons , who are 18 and 20 years old respectively, in such a way that the sum divided at the rate of 20% per annum, compounded annually, will give the same amount to each of them when they attain the age of 22 years. How should he divide the sum?
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- A certain sum of money invested at R% p.a. fetches a compound interest (compounded annually) of 1800 and simple interest of Rs.1600 at the end of 2 years. Find the value of ‘R’.
- A table is available for Rs.350 or for Rs. 150 cash down payment together with Rs.230 to be paid after two months. Find the rate of interest charged under this scheme.

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