The difference between the compound interest and simple interest on a
certain sum at 10% per annum for 2 years is Rs. 631. Find the sum.
Let the sum be Rs. x.
C.I. = x ( 1 + ( 10 /100 ))^2 - x = 21x / 100
S.I. = (( x * 10 * 2) / 100) = x / 5
(C.I) - (S.I) = ((21x / 100 ) - (x / 5 )) = x / 100
( x / 100 ) = 632
x = 63100
Hence, the sum is Rs.63,100.
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