The population of a town is decreasing at a rate of 10% per annum. If the population two years ago was 20,000, what is the present population?

16200 16000 15200 15000

16200

Population - 2 years ago = 20,000  Population - 1 year ago = 20,000 - 10% of 20,000 = 18,000 Population - Now = 18,000 - 10% of 18,000 = 16,200