Find the compound Interest on Rs. 8,000 @15 % p.a for 2 years 4 month Compounded annually?

C.I for 1 st year = (8000 × 15 × 1)/100 =1200 C.I for 2nd year = (9200 × 15 × 1)/100 = 1380 C.I for 1/3 year = (10580 × 15 × 1)/(100 × 3) = 529 Total C. I = 1200 + 1380 + 529 = Rs. 3109 Alternate Method ; If time is given in ratio (a + 1/b) years, then {Amount = Principal(1+ R/100)^{a} (1+R/100 × 1/b)} Here a= 2 & b =3 A= 8000 (1+15/100)^{2} (1+15/100×1/3) = 8000 × 23/20 × 23/20 × 21/20 = 11109 C.I = 11109 - 8000 C.I = Rs. 3109

- Some amount out of Rs. 12000 was lent out at 10% per annum and the rest amount @ 16% per annum and thus in 5 years the total interest from both the amount collected was Rs. 7200. What is the amount which was lent out at 10% per annum?
- A man invested a certain amount of sum at 5% per annum simple interest and earned an interest of Rs. 2500 after 5 years. If the same amount is invested at 15% per annum compound interest, compounded annually for two years then the interest would be:
- At what % of simple interest per annum will Rs. 400 amount to Rs. 520 in five years?
- There is 40% increase in an amount in 8 years at simple interest. What will be the compound interest of Rs. 16,000 after 3 years at the same rate?
- A took loan from a bank at the rate of 12%p.a. simple interest. After 5 years he had to pay Rs.7200 interest only for the period. The principal amount borrowed by him was:
- Mark invested Rs 15,000 in a scheme at simple interest 20% per annum. After three years he withdrew the principal amount plus invested the entire amount in another scheme for two years, which earned him compound interest 12% per annum. What would be the interest earned by Mark at the end of five years?
- A sum was put at simple interest at a certain rate for 2 years. If it had been put at 4% higher rate, it would have fetched ₹480 more. Find the sum
- If Rs. 12000 is invested at a simple interest at the rate of 5% p.a., Rs. 4800 is obtained as interest in certain years. In order to earn Rs. 6400 as interest on Rs. 20,000 in the same number of years, what should be the rate of simple interest?
- At what rate will Rs. 100 will earn an interest of Rs. 200 in 20 years?
- A certain amount earns simple interest of Rs. 1840 after 5 years. Had the interest been 4% more, how much more interest would it have earned?

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