52.12% is the change from 330 to 502
Calculation steps:
[( 502 - 330 ) ÷ 330] x 100 = 52.12%
Formula
Percentage change = [(502 - 330) / 330] x 100
Subtract the new number by the original number
502 - 330 = 172
172 ÷ 330 = 0.5212121212121212
0.5212121212121212 x 100 = 52.12%