Question
A sum of Rs. x is invested at simple interest at 9% per
annum for 5 years. If another sum of Rs. (x + 200) is also invested at the same rate for the same time, then the combined simple interest from both investments comes out to be Rs. 990. Find x.Solution
ATQ, SI = PNR/100 SI = x * 9 * 5/100 SI = 0.45x SI = (x + 200) * 9 * 5/100 SI = 0.45x + 90 Â (0.45x + 0.45x + 90) = 990 0.9x = 990 - 90 0.9x = 900 x = 900 / 0.9 x = 1000
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