-15.57% is the change from 501 to 423
Calculation steps:
[( 423 - 501 ) ÷ 501] x 100 = -15.57%
Formula
Percentage change = [(423 - 501) / 501] x 100
Subtract the new number by the original number
423 - 501 = -78
-78 ÷ 501 = -0.15568862275449102
-0.15568862275449102 x 100 = -15.57%