Math 9/10 proof

W.A.L.T. Combine simple proportions.

This is proof that I have achieved 90% in my task.

Here is an example or the maths task I had to complete: 

What is the percent of increase from 50 to 100. Answer 50.

This is because the 50 is half of 100 and 50 percent is the same as 1/2

so the increase is 50%