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**a)In how much time will simple interest on a sum of money be 2/5th of the sum, at the rate** **of 10% per annum b) At what rate of interest will simple interest be half the principal in 5 years.**** c)A sum of money amounts to Rs. 1265 in 3 years and to Rs.1430 in 6 years, at simple** **interest. Find the sum and the rate percent.**

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