Given, \( \Large A = \frac{5}{6} B \) Let income of B = x Therefore,  \( \Large A = \frac{5}{6}x \) Required percentage = \( \Large \frac{x-\frac{5x}{6}}{\frac{5x}{6}} \times 100 \) = \( \Large \frac{6x-5x}{5x} \times 100 \)
= \( \Large \frac{1}{5} \times 100 \) = 20%