Question

the simple interest on a certain sum of money for 5 years at 10% annum is rupees 196 less than the simple interest on the same sum for 4 years at 16% per annum find the sum

Answer 1

amount (SI) - Amount (CI) =196

P+ (P×16×4/100) - P(1+ 10/100)^5=196

164P/100 -P(11×11×11×11×11 / 10×10×10×10×10)=196

164P/100 - 161051P/100000 =196

(164000P- 161051P)100000 =196

2949P/100000 =196

P=6646.32

$sum = 6646.32$