Q.Deepak’s salary was increased from ₹ 4,000 to ₹ 5,000. The sales being the same, due to reduction in the rate of commission from 3% to 2%, his income remained unchanged. Find his sales.

Total sales $= \frac{58500}{0.125} = ₹4{,}68{,}000$; number of computers $= \frac{4{,}68{,}000}{18{,}000} = 26$.

Commission is $12.5\%$ of total sales. If $S$ is the total sales value,

$\text{Commission} = 12.5\% \text{ of } S \;\Rightarrow\; 58{,}500 = \frac{12.5}{100}\,S = 0.125\,S.$

Solve for $S$: …