If A's income is 25% more than B's, and B's income is 20% more than C's, then by what percentage is A's income more than C's?

A's income is 50% more than C's.

Let C = 100; B is 20% more, so B = 120.

A is 25% more than B: A = 120 x 1.25 = 150.

Difference of A over C = 150 - 100 = 50.

50 / 100 x 100 = 50%.

So A's income is 50% more than C's.