-15.94% is the change from 502 to 422
Calculation steps:
[( 422 - 502 ) ÷ 502] x 100 = -15.94%
Formula
Percentage change = [(422 - 502) / 502] x 100
Subtract the new number by the original number
422 - 502 = -80
-80 ÷ 502 = -0.1593625498007968
-0.1593625498007968 x 100 = -15.94%