Suresh invested a certain sum of money at 5% per annum simple interest. If he receives an interest of ₹69,687 after 15 years, the sum (in ₹) he invested is:

The formula for Simple Interest (SI) is:
SI=
100
P×R×T
​

Given:

SI=₹69,687

R=5% per annum

T=15 years

Substitute the values into the formula:

69687=
100
P×5×15
​

69687=
100
75P
​

69687=
4
3
​
P
Solving for P:

P=
3
69687×4
​

P=23229×4=92916
Thus, the sum invested is ₹92,916.