-39.64% is the change from 502 to 303
Calculation steps:
[( 303 - 502 ) ÷ 502] x 100 = -39.64%
Formula
Percentage change = [(303 - 502) / 502] x 100
Subtract the new number by the original number
303 - 502 = -199
-199 ÷ 502 = -0.39641434262948205
-0.39641434262948205 x 100 = -39.64%