19.22% is the change from 255 to 304
Calculation steps:
[( 304 - 255 ) ÷ 255] x 100 = 19.22%
Formula
Percentage change = [(304 - 255) / 255] x 100
Subtract the new number by the original number
304 - 255 = 49
49 ÷ 255 = 0.19215686274509805
0.19215686274509805 x 100 = 19.22%