Question

the compound interest at 10percent per annum on a sum is rs. 4200 in 2years. Find the sum

Answer 1

here is your answer OK

If X is the principal,

X* 110/100 X 110/100 = X + 4200

1.21 X = X + 4200

1.21X - X = 4200

.21 X= 4200

X = 4200/ .21 = 20000

Now S I, for 2 years,

X * 2* 10/100 = 4000