In 3 years by compound interest, a sum becomes Rs. 900. But in 4 years by compound interest, the same sum becomes Rs. 1000. What is the sum and the rate of interest?
A.Rs. 625.20, 12.50%
B.Rs. 656.10, 11.11%
C.Rs. 686.50, 12.50%
D.Rs. 695.80, 11.11%
Answer: B
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