The difference between simple interest and compound interest of a certain sum of money at 20% per annum for 2 years is Rs. 56. Then the sum is :

We know thatThe Difference between Compound Interest and Simple Interest for n years at R rate of interest is given by  $C.In - S.In = P\frac{R}{100}n$

Here n = 2 years, R = 20%, C.I - S.I = 56

$56 = P\frac{20}{100}2=> P = 56 x 52=> P = 56 x 25=> P = \mathrm{Rs}. 1400$