R. S. Aggarwal Solutions for Chapter: Compound Interest, Exercise 1: EXERCISE 22A

A man covers a certain distance in $2$ hours $45 \min$ when he walks at the rate of $4 \mathrm{km}/\mathrm{hr}$. How much time will he take to cover the same distance if he runs at the speed of $16.5 \mathrm{km}/\mathrm{hr}$ ?

A boy takes as much time in running $10$ metres as a car takes in covering $40$ metres. What is the distance covered by the boy in running, during the time in which the car covers $1 \mathrm{km}$ ?

Excluding stoppages, the speed of a bus is $54 \mathrm{km}/\mathrm{hr}$ and including stoppages, it is $45 \mathrm{km}/\mathrm{hr}$. For how many minutes does the bus stop per hour?

A man borrowed $\mathrm{Rs}.400000$ from a bank at $10\%$ per annum, compounded annually. At the end of every year, he pays $\mathrm{Rs}.150000$ as part payment of the loan and interest. How much does he still owe to the bank after three such instalments?

The value of a machine depreciates every year at the rate of $10\%$ on its value at the beginning of that year. If the present value of the machine is $\mathrm{Rs}.72900,$ its worth $3$ years ago was :

The present worth of $\mathrm{Rs}.72900$ due $2$ years hence at $8\%$ per annum, is

A loan was repaid in two annual instalments of $\mathrm{Rs}.121000$ each. If the rate of interest be $10\%$ per annum, compounded annually, the sum borrowed was :

A sum of $\mathrm{Rs}.53000$ was taken as a loan. This is to be repaid in two equal annual instalments. If the rate of interest be $12\%$ per annum, compounded annually, the value of each instalment is :