-41.78% is the change from 438 to 255
Calculation steps:
[( 255 - 438 ) ÷ 438] x 100 = -41.78%
Formula
Percentage change = [(255 - 438) / 438] x 100
Subtract the new number by the original number
255 - 438 = -183
-183 ÷ 438 = -0.4178082191780822
-0.4178082191780822 x 100 = -41.78%