-74.5% is the change from 502 to 128
Calculation steps:
[( 128 - 502 ) ÷ 502] x 100 = -74.5%
Formula
Percentage change = [(128 - 502) / 502] x 100
Subtract the new number by the original number
128 - 502 = -374
-374 ÷ 502 = -0.7450199203187251
-0.7450199203187251 x 100 = -74.5%