Question

The simple interest on a certain sum for 4 years at 9% per annum is 216 less than simple interest on the same sum for 3 year at 18% per annum. Find the sum

Answer 1

Explanation:

Let the sum be P ..

SI for first case = ( P * 4 *9 ) / 100

= (36 * P) / 100

SI for second case = ( P * 3 * 18 ) / 100

= ( 54 * P ) / 100

Difference = 216

BTC

( 54 * P ) / 100 - ( 36 * P ) /100 = 216

54P - 36P = 21600

18P = 21600

P = 21600 / 18

P = 1200

The sum is Rs.1200 ( ans)