If A's income is 5/6th of B's income, then B's income is more than A's income by

Given, A = 5B/6
Let Income of B = N
∴ A = 5N/6
Required percentage = [(N - 5N/6) / (5N/6)] x 100
= [(6N - 5N)/5N] x 100
= (1/5) x 100 = 20%