A’s income is 20% less than that of B. By what per cent is B’s income more than A’s?
Let B’s income = 100
Then, A’s income = (100 – 20) = 80
∴ B’s income more than A’s income = (100 – 80)/80 × 100
= 20/80 × 100
= 1/4 × 100
= 25