-22.64% is the change from 508 to 393
Calculation steps:
[( 393 - 508 ) ÷ 508] x 100 = -22.64%
Formula
Percentage change = [(393 - 508) / 508] x 100
Subtract the new number by the original number
393 - 508 = -115
-115 ÷ 508 = -0.2263779527559055
-0.2263779527559055 x 100 = -22.64%