13. Find the principal, if the compound interest payable annually at 10% per annum for 3 years is 1331. 14. In what time will ?1,200 amount to 1,323 at 5% per annum when the interest is payable annually? 15. In what time wil ? 64,000 amount to ? 88,360 at $17 \frac{1}{2}$% per annum, interest being compounded yearly? 16. Sangeeta invested ? 20,000 in the bank for 4 years and got back ? 29,282 after 4 years. What was the rate of interest per annum payable annually? 17. Vasudha deposited a certain amount with a leasing company at the rate of interest of 20% compounded annually. At the end of 3 years, he received back ? 21,600. Find the amount deposited. 18. Mr. Raghava has deposited ? 8,000 with a finance company for a period of 1 year. The company credits the interest quarterly. He received ? 9,724.05 after one year. Find the rate of interest per cent per annum. 19. Rajesh borrowed ? 5,000 from a bank. He will have to pay ? 10,000 after 5 years. Find the rate of interest, if the interest is payable half yearly. (Take $\sqrt[10]{2} = 1.072$) Direct Variation
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