## Q- As the farmers are becoming more alert of the harmful effects of applying only the chemical fertilizers and insecticides in agricultural lands, the number of farmers using fertilizers and insecticides in village of Rasulpur decreases by 20% in a year in comparison to its previous year. Three years before, the number of such farmers was 3000, let us calculate the number of such farmers in that village now.

Chapter: Compound Interest and Uniform rate of Increase or Decrease

## Q- Weight of Savan babu is 80 kg. in order to reduces his weight, he started regular morning walk. He decided to reduce his weight every year by 10%. Let us write by calculating, his weight after 3 years.

Chapter: Compound Interest and Uniform rate of Increase or Decrease

## Q- As a result publicity on smoking, the number of smoker is decreased by 1 ¼ every year in comparison to its previous year. If the number of smokers at present in a city is 33750, let us write by calculating, the number of smoker in that city 3 years before.

Chapter: Compound Interest and Uniform rate of Increase or Decrease