Question
Rs. x is invested at simple interest at the rate of 10%
per annum for 3 years. If Rs. (x + 300) is invested at the same rate of interest for the same period, the total interest obtained from both investments is Rs. 990. Find the value of x.Solution
ATQ, SI = PNR/100 SI = x * 10 * 3/100 SI = 0.3x SI = (x + 300) * 10 * 3/100 SI = 0.3x + 90 (0.3x + 0.3x + 90) = 990 0.6x = 990 - 90 0.6x = 900 x = 900 / 0.6 x = 1500
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