8.24% is the change from 255 to 276
Calculation steps:
[( 276 - 255 ) ÷ 255] x 100 = 8.24%
Formula
Percentage change = [(276 - 255) / 255] x 100
Subtract the new number by the original number
276 - 255 = 21
21 ÷ 255 = 0.08235294117647059
0.08235294117647059 x 100 = 8.24%