280.78% is the change from 255 to 971
Calculation steps:
[( 971 - 255 ) ÷ 255] x 100 = 280.78%
Formula
Percentage change = [(971 - 255) / 255] x 100
Subtract the new number by the original number
971 - 255 = 716
716 ÷ 255 = 2.8078431372549018
2.8078431372549018 x 100 = 280.78%