-95.82% is the change from 502 to 21
Calculation steps:
[( 21 - 502 ) ÷ 502] x 100 = -95.82%
Formula
Percentage change = [(21 - 502) / 502] x 100
Subtract the new number by the original number
21 - 502 = -481
-481 ÷ 502 = -0.9581673306772909
-0.9581673306772909 x 100 = -95.82%