-21.96% is the change from 501 to 391
Calculation steps:
[( 391 - 501 ) ÷ 501] x 100 = -21.96%
Formula
Percentage change = [(391 - 501) / 501] x 100
Subtract the new number by the original number
391 - 501 = -110
-110 ÷ 501 = -0.21956087824351297
-0.21956087824351297 x 100 = -21.96%