Question
A man invested Rs. 'B' at simple interest of 18% and Rs.
'B + 4000' at simple interest of 14% p.a., for 4 years each. If the interest earned from both investments is the same, then find the sum invested at the lower rate of interest.Solution
ATQ, Simple interest = Sum X rate of interest X time period of investment ÷ 100 ATQ; 
Or, 7.2B = (B+4000)×5.6 Or, 7.2B = 5.6B+22400 Or, 1.6B = 22400 Or, B = 14000 So, sum invested at lower interest = 14000 + 4000 = Rs. 18,000
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