Simple interest for three years for a certain sum at the rate of 15% is ₹ 9000. If the rate of interest becomes 30%, then what will be the simple interest for two years?
Let the principal be Rs.P
Rate of interest = 15% per annum
Time period = 3 years
$$\dfrac{P\times15\times3}{100} = Rs.9000$$
=> $$P = \dfrac{900000}{45} = Rs.20000$$
Now, Rate of interest = 30% per annum
Time period = 2 years
$$\dfrac{20000\times30\times2}{100} = Rs.12000$$
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