3.59% is the change from 502 to 520
Calculation steps:
[( 520 - 502 ) ÷ 502] x 100 = 3.59%
Formula
Percentage change = [(520 - 502) / 502] x 100
Subtract the new number by the original number
520 - 502 = 18
18 ÷ 502 = 0.035856573705179286
0.035856573705179286 x 100 = 3.59%