35.29% is the change from 255 to 345
Calculation steps:
[( 345 - 255 ) ÷ 255] x 100 = 35.29%
Formula
Percentage change = [(345 - 255) / 255] x 100
Subtract the new number by the original number
345 - 255 = 90
90 ÷ 255 = 0.35294117647058826
0.35294117647058826 x 100 = 35.29%