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A certain sum on compound interest becomes 56,180 when compounded annually after 2 years and 59,550.80 after 3 years Find the sum.
If the ratio of the sum invested and simple interest received after 1 year is 25:16 respectively, then find the rate of interest.
In how much time will a sum of Rs. 5250 amounts to Rs. 9870 at the rate of 11 percent per annum at simple interest?