A bank gives 10% Simple Interest(S.I.) on deposits by senior citizens. Draw a graph to illustrate the relation between the sum deposited and simple interest earned. Find from your graph the following

a) The annual interest obtainable for an investment of Rs. 250.

b) The investment one has to make to get an annual simple interest of Rs. 70.

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Solution

Using the simple interest formula, for different values of the principal sum we get different values of annual interest as shown in table below.

$\begin{matrix} Deposit (in Rs) & 100 & 200 & 300 & 500 & 1000 Annual S.I. (in Rs) & 10 & 20 & 30 & 50 & 100 \end{matrix}$

The following graph is drawn with appropriate scale.

a) The annual interest for an investment of Rs 250 is Rs 25.

b) The investment one has to make to get an annual simple interest of Rs 70 is Rs 700.

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