Question
A woman invested Rs. 'x + 500' at 8% per annum simple
interest and received Rs.360 as interest after 3 years. Calculate the interest she would earn if she invested Rs.3x at 9% per annum for 3 years at compound interest.Solution
ATQ, The simple interest equation is: 
For compound interest on Rs. 3x (which is Rs. 3000) at 9% for 3 years: 
Interest earned = 3885.087 - 3000 = Rs.885.087
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