Question

the simple interest on a certain sum of money for 5/2 years at 12% per annum is Rs 40 less then the simple interest on the same sum of 7/2 years at 10% .Find the sum

Answer 1

please find the attachment

Answer 2

Let the principle be Rs = p
P*7/2*10/100-p*5/2*12/100 = 40
70p/200-60p/200 = 40
10p/200p = 40
P = ₹800