The salary of a man increases by 20% every year in the month of January. His salary was Rs.5000 in the month of February in year 2009. What will be his salary in the month of February in the year 2011?

Rajesh gave 40% of his amount to Nisha and Nisha gave 45% of that amount to kapil. If kapil got Rs.1440 from Nisha, what was the original amount with Rajesh?

The population of a town is 25280. It increases by 10% in the first year and decreases by 25% in the second year. What is the population of the town at the end of two years?

A newspaper vendor sells a newspaper at the rate of Rs.5 per copy and earns a commission of 15%. If he sells 1200 copies of newspaper a day, how much commission will he earn in a week?