Question

a photocopier increase the sides of a square in a ratio of 5:4. what percentage has the size increased?

Answer 1

5-4 divided by 4
1/4 = .25 or 25%

Now, check your answer.

1/4 of 4 = 1 added to 4 gets the 5.

Answer 2

Or 5/4 = 1.25 = 125%.
125% - 100% = 25%.