R. S. Aggarwal Solutions for Chapter: Simple Interest, Exercise 1: EXERCISE 21A

 In how much time will a sum of money double itself at $12\%$ per annum simple interest ?

$\mathrm{Rs}12000$ amounts to $\mathrm{Rs}16320$ in $4$ years at a certain rate of simple interest. If the rate of interest is increased by $1\%$, what would be the amount?

The simple interest on a certain sum of money for $2\frac{1}{3}$ years at $8\frac{1}{3}\%$ per annum is $\mathrm{Rs}560$ . The sum is

A man invests money in three different schemes for $6$ years, $10$ years and $12$ years at $10\%,12\%$ and $15\%$ simple interest respectively. At the completion of each scheme, he gets the same interest. The ratio of the investments is :

Simple interest on a certain sum at a certain annual rate of interest is $\frac{25}{16}$ of the sum. If the numbers representing rate percent and time in years be numerically equal, then rate percent per annum is :

On a certain sum, the simple interest at the end of $12\frac{1}{2}$ years becomes $\frac{3}{4}$ of the sum. What is the rate percent per annum?

Simple interest on a certain sum at a certain annual rate of interest is $\frac{9}{16}$ of the sum. If the numbers representing rate percent and time in years be numerically equal, then rate percent per annum, is

A man loses $\mathrm{Rs}111$ yearly, when the annual rate of simple interest falls from $11.5\%$ p.a. to $10\%$ p.a. His capital is: