-21.12% is the change from 502 to 396
Calculation steps:
[( 396 - 502 ) ÷ 502] x 100 = -21.12%
Formula
Percentage change = [(396 - 502) / 502] x 100
Subtract the new number by the original number
396 - 502 = -106
-106 ÷ 502 = -0.21115537848605578
-0.21115537848605578 x 100 = -21.12%