-40.04% is the change from 502 to 301
Calculation steps:
[( 301 - 502 ) ÷ 502] x 100 = -40.04%
Formula
Percentage change = [(301 - 502) / 502] x 100
Subtract the new number by the original number
301 - 502 = -201
-201 ÷ 502 = -0.40039840637450197
-0.40039840637450197 x 100 = -40.04%