The simple interest on a sum of money for 10 years is Rs 3130. If the principal becomes 5 times after 5 years, then what will be the total interest (in Rs) obtained after 10 years?
Let the principal = Rs. $$x$$Â
Simple interest after 10 years = Rs. 3130
=> Interest in 5 years = $$\frac{3130}{2}=Rs.$$ $$1565$$
Also, after 5 years the principle becomes five times, => Interest for the remaining 5 years also becomes 5 times
= $$5\times1565=Rs.$$ $$7825$$
$$\therefore$$ Total interest obtained at the end of 10 years = $$7825+1565=Rs.$$ $$9390$$
=> Ans - (C)
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