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If the difference between the simple and compound interests on a sum of money for 2 years at 4% per annum is 80, the sum is :
Options:
A .  1000
B .  5000
C .  10000
D .  50000
Answer: Option D
Answer: (d)Using Rule 6,When difference between the compound interest and simple interest on a certain sum of money for 2 years at r % rate is x, then the sum is given by$x(100/r)^2$ Here x = Rs.80, r = 40%Required sum = 80$(100/4)^2$= 80 × 25 × 25 = Rs.50000

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