A sum of money doubles itself in 10 years at simple interest. What is the rate of interest?

Let the sum = Rs. x ∴ S.I = Rs. x ∴ R = (x× 100)/(x× 10) = 10% p.a.

- A certain sum of money invested at R% p.a. fetches a compound interest (compounded annually) of 1560 and simple interest of Rs.1500 at the end of 2 years. Find the value of ‘R’.
- A Man deposited certain amount in the Bank at the end of each year. How much amount did he deposited at the end of each year at the rate of 15% simple Interest, so that he will get Rs. 1960 at the end of 4
^{th}year? - Veeru invested Rs. 2800 at 20% p.a. simple interest for 3 years. After 3 years, he invested the amount received by him at the 20% p.a. compound interest, compounded annually for another 2 years. Find the final amount received by Veeru at the end of 5 years.
- A person invest some amount in a business into 2 parts. If he invest 1st part at 8% for 3 years and 2nd part invest at 7*1/2% p.a. for 4 years. Total Simple Interest from both instalment is Rs. 2262. If 2/5th of the sum of first investment is equal to 3/7 times of the 2nd investment. Find the sum (principal) of each part?
- Rohit invested a certain amount at the rate of 6 p.c.p.a. and obtained a simple interest of Rs 8,730 at the end of 3 years. What amount of compound interest would he obtain on the same amount at the same rate of interest at the end of 2 years?
- Sam invested a certain sum in scheme A for 5 years and in scheme B for 3 years, a sum which was double of that invested in scheme A. Both the schemes offer simple interest at the rate of 8% p.a. The difference between the amounts received from both the schemes was Rs. 12960. How much did Sam invest in scheme A?
- A man invested a certain amount of sum at 10% per annum simple interest and earned an interest of Rs. 3000 after 5 years. If the same amount is invested at 25% per annum compound interest, compounded annually for two years then the interest would be:
- A person invested some amount at the rate of 12% simple interest and a certain amount at the rate of 10% simple interest. He received yearly interest of Rs 140. But if he had interchanged the amounts invested, he would have received Rs 6 more as interest. How much did he invested at 10% simple interest initially?
- A certain sum of money yields Rs. 3,310 as compound interest for 3 years at 10% per annum. The sum is (in rupees).
- Rs. 7000 is invested in scheme ‘A’ for 2 years and Rs. 5000 is invested in scheme ‘B’ for 2 years. Scheme ‘A’ offers simple interest of 15% p.a. If the interest received from both the schemes are equal, then find the rate of simple interest (p.a.) offered by scheme ‘B’.

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