Question
Rs. (4x + 200) is invested at a simple interest rate of
18% per annum, earning an interest of Rs. 2160 after 4 years. Calculate the interest earned when Rs. (5x - 100) is invested at the same rate for the same period.Solution
Given Data: Principal = 4x+200 Interest earned = Rs. 2160 Rate = 18% per annum Time = 4 years Calculate 'x' by Using the simple interest formula: 
Simplify to find x=700. New Principal: Substitute x=700 into 5x−100: 5(700)−100=3400 Calculate New Interest: Use the simple interest formula again 
The interest earned on Rs. 3400 is Rs. 2448.
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