John borrowed some money from Alex at 10% simple interest per annum. He lended this money to Shaun at 20% compound interest per annum, and made a profit of Rs. 33680 in 4 years. Find the amount that John borrowed?

- Simple interest on a sum of money for 2 years is 1/5th of the sum, then the interest received in 5 years on same principal will be what time of the principal?
- 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?
- A man deposited Rs. 20000 at 10% compound interest, compounded annually while Rs. 19000 at 12% simple interest per annum. What will be the difference between the compound interest and the simple interest earned by him after 3 years?
- What will be the amount if a sum of Rs. 6500 is placed at compound interest for 3 years while the rate of interest for the first, second and third years is 4%, 5% and 6% respectively?
- 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?
- A man borrowed Rs 200 and promised to pay back in 11 equal instalments of Rs 20 each. Find the rate of simple interest per annum?
- A woman invests Rs. 2000 at the start of each year at 5% compound interest per annum. How much will her investments be at the end of the 2nd year?
- The difference between the compound interest, compounded annually and simple interest on Rs. ‘P’ at the rate of 25% p.a. for 2 years, is Rs. 100. If Rs. (P + 1600) is invested at the same rate p.a., then find the compound interest, compounded annually earned after 3 years.
- A certain amount earns simple interest of Rs. 1420 after 4 years. Had the interest been 5% more, how much more interest would it have earned?
- A certain sum of money yields Rs. 3,310 as compound interest for 3 years at 10% per annum. The sum is (in rupees).

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