A sum of money amounts to Rs. 11910.16 in years at 12% per annum interest being compounded semi annually. Find the sum.

10 Find the compound interest on Rs. 5000 for 1 year at 8% per annum compounded half-yearly. 11 Find the amount and the interest on Rs. 16000 for 3 years at 5% per annum compounded annually. 13 The population of a village is 50000. It increases by 5% every year. Find the population at the end of 2 years. 14 The population of a city increases by 4% of what it had been at the beginning of each year. If the population in 1997 had been 6760000, find the population of the city in (i) 1999 (ii) 1995.