A sum of money will amount to Rs. 640 in 2 year & in 3 year it is to be 720 in compound interest . Find the rate of interest?

Rate of interest = (720- 640)/640 × 100 = 80/640 × 100 = 12.5%

- A man borrowed Rs 300 and promised to pay back in 11 equal instalments of Rs 30 each. Find the rate of simple interest per annum?
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- Anil borrowed Rs.20000 on CI at the rate of 10% for three years. He paid at the end of first year (1/8)th of amount and end of second year (1/5)th of amount. How much amount Anilhave to pay at the end of third year to complete his debt?
- At what % of simple interest per annum will Rs. 600 amount to Rs. 780 in five years?
- Rs. 10000 is invested in scheme ‘A’ for a year at simple interest of 29% p.a. The interest received from scheme ‘A’ is reinvested for 2 years in scheme ‘B’ which offers compound interest (compounded annually) of 50% p.a. What is the total amount received from scheme ‘B’?
- Ajay invested Rs.a in SI at 9% rate of interest per annum for 10 years. Vishal invested the same amount in SI at 4% rate of interest per annum for 5 years and the difference between the interest obtained by Ajay and Vishal is Rs.1400. Find the amount invested by Vishal.
- The simple interest received on a certain sum is Rs. 480 less than the sum invested. If the sum was invested at 12% p.a. for 7 years, then find the simple interest received.
- A sum was put at simple interest at a certain rate for 7 years. Had it been put at 6 % higher rate, it would have fetched Rs. 1260 more. Find the sum?
- Simple interest on a sum of Rs 100 is Rs. 144. If rate percent is equal to the number of year then find the rate percent.

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