25%
Because 25% (1/4) of four is 1/1 or simply just 1. Now if we subtract 1 from 4 we get 3. This is the same as subtracting 25% from four.
To find the percentage of a number thorn the percentage into a fraction and multiply them together. e.g. 1/4 * 4 = 4/4 = 1
