4% is the change from 500 to 520
Calculation steps:
[( 520 - 500 ) ÷ 500] x 100 = 4%
Formula
Percentage change = [(520 - 500) / 500] x 100
Subtract the new number by the original number
520 - 500 = 20
20 ÷ 500 = 0.04
0.04 x 100 = 4%
Example