If the difference between the compound interest compounded annually and the simple interest on a certain sum of money for three years at 10%per annum is ₹279, then the sum (in ₹)is:

9,000

The formula we used here is :-

Difference between CI and Si = \(\frac{P × R²× ( 300 + R) }{(100)³}\)

ATQ,

\(\frac{P × 10²× ( 300 + 10) }{(100)³}\) = 279

\(\frac{P × ( 300 + 10) }{(100)²}\) = 279

P = Rs. 9000