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1. An amount of Rs. 680 was invested at 6% rate of interest and another sum of money was invested at 10% interest. If the average interest on the total at the end of the year was 7.5%, how much was invested at 10%?

A. Rs. 408

B. Rs. 412.6

C. Rs. 267.5

D. None of these

Solution:

Now,

\frac{680}{x} = \frac{2.5}{1.5}

Or,

x = \frac{680 \times 3}{5}

Hence, x = Rs. 408

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