-24.56% is the change from 338 to 255
Calculation steps:
[( 255 - 338 ) ÷ 338] x 100 = -24.56%
Formula
Percentage change = [(255 - 338) / 338] x 100
Subtract the new number by the original number
255 - 338 = -83
-83 ÷ 338 = -0.2455621301775148
-0.2455621301775148 x 100 = -24.56%