Through publicity of road-safety programme, the street accidents in Purulia district are decreased by 10% in comparison to its previous year. If the number of street accidents in this year be 8748, let us write by calculating, the number of street accidents 3 years before in the district.

The price of a machine in a leather factory depreciates at the rate of 10% every year. If the present price of the machine be ₹ 100000, let us calculate what will be the price of that machine after 3 years.

As a result of Sarba Siksha Abhiyan, the students leaving the school before completion, the students are readmitted, so the students in a year in increased by 5% in comparision to its previous year. If the number of such readmitted students in a district be 3528 in the present year. Let us write by calculation, the number of students readmitted 2 years before in this manner.

A cooperative society of fisherman implemented such an improved plan for the production of fishes that the production in a year will be increased 10% in comparision to its previous year. In the present year if the cooperative society can produce 406 quintals of fishes, let us write by calculating, what will be the production of fishes after 3 years.

The height of tree increases at the rate of 20% every year. If the present height of tree is 28.8 metre, let us calculate the height of tree 2 years before.