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Vishwas borrowed a total amount of Rs. 30000, part of it on simple interest rate of 12 pcpa and remaining on simple interest rate of 10 pcpa If at the end of 2 year she paid in all Rs. 36480 to settle the loan amount, what was the amount borrowed at 12 pcpa ?

A. Rs. 12000 B. Rs. 16000 C. Rs. 17500 D. Rs. 18000 Answer: Option A
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Solution(By Apex Team)

Let the sum borrowed at 12% pa be Rs. x and that borrowed at 10% pa be Rs. (30000 – x) SI at the end of 2 years = Rs. (36480 – 30000) = Rs. 6480 $\begin{array}{l}\therefore\left(\frac{x\times12\times2}{100}\right)+\left[\frac{(30000-x)\times10\times2}{100} \right]=6480\\ \Leftrightarrow24x+600000-20x=648000\\ \Leftrightarrow4x=48000\\ \Leftrightarrow x=12000\end{array}$