The population of a certain city was 72000 on the last day of the year 1998. During next year it increased by 7% but due to an epidemic it decreased by 10% in the following year. What was its population at the end of the year 2000?
Given,
Population of city on last day of year 1998 = 72000
Increasing rate in 1999 = 7%
Decreasing rate in 2000 = 10 %
So,
Population at the end of 2000 = 
10