Question
Rs. x is placed at simple interest at 12% per annum for
2 years. If instead Rs. (x + 400) is invested at the same rate and for the same duration, the total interest earned from both sums together is Rs. 864. Find the value of x.Solution
ATQ, SI = PNR/100 SI = x * 12 * 2/100 SI = 0.24x SI = (x + 400) * 12 * 2/100 SI = 0.24x + 96 (0.24x + 0.24x + 96) = 864 0.48x = 864 - 96 0.48x = 768 x = 768 / 0.48 x = 1600
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