-21.56% is the change from 501 to 393
Calculation steps:
[( 393 - 501 ) ÷ 501] x 100 = -21.56%
Formula
Percentage change = [(393 - 501) / 501] x 100
Subtract the new number by the original number
393 - 501 = -108
-108 ÷ 501 = -0.2155688622754491
-0.2155688622754491 x 100 = -21.56%