Rate of increase in population of a state is 2% in a year. The present population is 80000000; let us calculate the population of the state after 3 years.

At present the population of a village is p and if increase rate of population per year be 2r%, the population will be after n years

A person deposited ₹100 in a bank and got the amount ₹121 for two years the rate of compound interest is

Let us fill in the blanks:

(i) The compound interest and simple interest for one year at the fixed rate of interest on fixed sum of money are_____________.

(ii) If some things are increased by fixed rate with respect to time, that is ___________.

(iii) If some things are decreased by fixed rate with respect to time this is uniform rate of ___________.

present price of a machine is ₹2p and if price of the machine decreases by 2r% in each year, the price of machine will be.

As a result of continuous publicity on harmful reactions in the use of cold drinks filled, bottles, the number of users of cold drinks is decreased by 25% every year in comparison to its previous year. 3 years before number of users of cold drink in a town was 80000. Let us write by calculating, the number of users of cold drink in the present year.

As the farmers are becoming more alert of the harmful effects of applying only the chemical fertilisers and insecticides in agricultural lands, the number of farmers using fertilisers 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.

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.

Weight of Savan babu is 80kg. 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.

As a result of publicity on smoking, the number of smoker is decreased by % 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 the city 3 years before.

Three years before from today a family had planned to reduced the expenditure of electric bill by 5% in comparison to its previous year. 3 year before, that family had to spend ₹4000 in a year for electric bill. Let us write by calculating how much amount will the family have to spend to pay the electric bill in the present year.