Find the compound interest on Rs. 125000 for 9 months at 8% per annum compounded quarterly.

16 Find the compound interest on Rs. 15625 for years at 8% per annum when compounded half-yearly. 17 Find the compound interest on Rs. 160000 for 2 years at 10% per annum when compounded semi-annually. 19 The population of a town 2 years ago was 62500. Since some persons migrate to different cities the number of people decreases every year at the rate of 4% per annum. Find its present population.  20 The present population of a town is 12500 and it is increasing at the rate of 8% per annum. What will be the population of the town after 2 years?