-34.26% is the change from 502 to 330
Calculation steps:
[( 330 - 502 ) ÷ 502] x 100 = -34.26%
Formula
Percentage change = [(330 - 502) / 502] x 100
Subtract the new number by the original number
330 - 502 = -172
-172 ÷ 502 = -0.3426294820717131
-0.3426294820717131 x 100 = -34.26%