22.5% is the change from 520 to 637
Calculation steps:
[( 637 - 520 ) ÷ 520] x 100 = 22.5%
Formula
Percentage change = [(637 - 520) / 520] x 100
Subtract the new number by the original number
637 - 520 = 117
117 ÷ 520 = 0.225
0.225 x 100 = 22.5%
Example