-15.74% is the change from 502 to 423
Calculation steps:
[( 423 - 502 ) ÷ 502] x 100 = -15.74%
Formula
Percentage change = [(423 - 502) / 502] x 100
Subtract the new number by the original number
423 - 502 = -79
-79 ÷ 502 = -0.15737051792828685
-0.15737051792828685 x 100 = -15.74%