Question

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

Answer 1

let B's income be x
then A's income is 80/100x or 4x/5
now we are asked
$\frac{x - \frac{4x}{5} }{ \frac{4x}{5} } \times 100 \\ \frac{ \frac{x}{5} }{ \frac{4x}{5} } \times 100 \\ \frac{x}{4x} \times 100 \\ \frac{100}{4 } = 25$
answer is 25%
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