The difference between simple and compound interest on a certain sum of money for 2 years at 4 per cent per annum is 1. The sum of money is :
Options:
A .  650
B .  600
C .  560
D .  625
Answer: Option D Answer: (d)Using Rule 6,When difference between the CI and SI on a certain sum of money for 2 years at r % rate is x, thenSum = x × $(100/r)^2$= 1 × $(100/4)^2$ = Rs.625
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