Question

A man lends Rs. 10,000 in four parts. If he gets 8% on Rs. 2,000; 7.5% on Rs. Rs. 4,000 and 8.5% on Rs. 1,400, what per cent must be get for the remainder, if his average annual interest is 8.13% ?

• A. 9
• B. 9.25
• C. 10.5
• D. 8

Answer 1

The correct option is A 9

$\left[\frac{2000\times 8\times 1}{100}\right]+[4000\times \frac{15}{2}\times \frac{1}{100}]+[1400\times \frac{17}{2}\times \frac{1}{100}]+[2600\times R\times \frac{1}{100}]=\frac{8.13}{100}\times 10000=\frac{813}{10000}\times 10000$
$\Rightarrow 160+300+119+26R=813\Rightarrow R=9$