33.07% is the change from 502 to 668
Calculation steps:
[( 668 - 502 ) ÷ 502] x 100 = 33.07%
Formula
Percentage change = [(668 - 502) / 502] x 100
Subtract the new number by the original number
668 - 502 = 166
166 ÷ 502 = 0.33067729083665337
0.33067729083665337 x 100 = 33.07%