Monica Capoor Solutions for Chapter: Comparing Quantities III Compound Interest, Exercise 5: EXERCISE

The population of a town increases by $3\frac{1}{2}\%$ of its value at the beginning of each year. If the present population of the town is $8869743$, find the population of the town three years ago.

In how many years will the population of the town change from $15625$ to $17576$ if the rate of interest is $4\%$ per annum ?

The local government of a state has fixed that a certain percentage of villages, at the beginning of each year will be provided with TV sets in their community centres. The number of TV sets provided increased from $2500$ in $2011$ to $2601$ in $2013$ calculate the rate of growth of TV sets in villages in the state.

A motorcycle was purchased for $₹48000$. If its value depreciates every year by $10\%$, calculate the total depreciation in its value at the end of $3$ years. 

A car is purchased for $₹360000$. Its value depreciates at $10\%$ per annum during the first two years and at $20\%$ per annum during the third year. What will be its value after $3$ years.

The value of a car depreciates at $10\%$ per annum. It was purchased $3$ years ago. If its present value is $₹364500$, for how much it was purchased.

In a city there were $8000$ blood donors. As a result of blood donation camps organised by various schools in that city, the number of blood donors registered an increase of $20\%$ per annum. Find the total number of new donors registered during the next $1\frac{1}{2}$ years.

The bacteria in a culture grows by $5\%$ in first hour and increases $10\%$ in the second hour. If the count of the bacteria in a sample is $2500000$, what will be the count of bacteria after $2$ hours.