Stocks and Shares Practice Test 2

Let total investment = (80 × 73)
Income from 15% at 80
Income on investing 80 = Rs 15
Income on investing (80 × 73) $=\frac{15}{80}\times 80\times 73$ = Rs 1,095
Income from $13\frac{1}{5}\%$ at 73
= Income on investing 73 = Rs $\frac{66}{5}$
Income on investing (80 × 73) $=\frac{66}{5}\times \frac{1}{73}\times 80\times 73$ = Rs 1,056
Required difference = 1,095 - 1,056 = Rs 39