A's income is 20% less than that of B.

Question:

A's income is 20% less than that of B. By what per cent is B's income more than A's?

Solution:

Let B's income be Rs 100

Then, A's income $=$ Rs 80

Therefore, B's income is more than A's income by $=\frac{(100-80)}{80} \times 100 \%$

$=\frac{20}{80} \times 100 \%=25 \%$

= RS 125

$\therefore$ B's income is more than that of A's by $(125-100) \%$, i.e., $25 \%$.

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