Quantitative Aptitude :: Simple Interest - Discussion

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Explanation:
Simple interest is given by the formula SI = (pnr/100), where p is the principal, n is the number of
years for which it is invested, r is the rate of interest per annum
In this case, Rs. 1250 has become Rs.10,000.
Therefore, the interest earned = (10,000 - 1250) = 8750.
8750 = [(1250*n*12.5)/100]
=> n = 700 / 12.5 = 56 years.