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Simple Interest
1. S.I. on Rs. 972 at 14 % per annum for a certain time is Rs. 476.28 . Find the time ?
2. S.I. on Rs. 972 at a certain rate % per annum for 3.5 years is Rs. 476.28 . Find the rate ?
3. A sum of money lent at simple interest amounts to Rs 1008 in 2 years and to 1112 in 3 years. Find the sum & the rate of i ...
4. What sum of money lent out at simple interest at 9 % p.a. for 3/2 years will produce the same interest as Rs 2250 lent ...
5. A man puts out Rs 500 for 4 years on simple interest and Rs 600 for 3 years. The total interest he receives is Rs 19 ...
6. A sum was put at simple interest at a certain rate for 2 years. Had it been put at 3 % highere rate, it whould have fet ...
7. Divide Rs 16875 into two parts such that the interest at 7/2 % p.a. for 2 years on one part is equal to the other at ...
8. A shopkeeper borrowed Rs. 20000 from two money lenders. For one loan he paid 12 % and for the other 14 % per annum. Af ...
9. At what rate percent per annum will sum of money double in 8 years?
10. Rajeev deposited money in the post office which is doubled in 20 years at a simple rate of interest. In how many years w ...
11. Find the simple interest on Rs. 730 for 184 days at 25/4 % per annum.
12. Find the simple interest on Rs. 4660 for 5 years at 7/2 % per annum.
13. The interest on a certain amount of money at 8 % per year for a period of 4 years is Rs 512 . Find the sum of money.
Problem 10 of 13
10. Rajeev deposited money in the post office which is doubled in
years at a simple rate of interest. In how many years will the original sum triple itself ?
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Simple Interest
10. Rajeev deposited money in the post office which is doubled in 20 years at a simple rate of interest. In how many years will the original sum triple itself ?
Let, Sum = `X`, Time = `20` years and Amount = `2X`.
`:. SI = X. `
`SI = (P*R*N)/100`
`R = (SI * 100)/(P * N) = (X * 100)/( X * 20 ) = 5` %
`:.` sum of money double at `5` % in `20` years.
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