-25.66% is the change from 343 to 255
Calculation steps:
[( 255 - 343 ) ÷ 343] x 100 = -25.66%
Formula
Percentage change = [(255 - 343) / 343] x 100
Subtract the new number by the original number
255 - 343 = -88
-88 ÷ 343 = -0.2565597667638484
-0.2565597667638484 x 100 = -25.66%