278.82% is the change from 255 to 966
Calculation steps:
[( 966 - 255 ) ÷ 255] x 100 = 278.82%
Formula
Percentage change = [(966 - 255) / 255] x 100
Subtract the new number by the original number
966 - 255 = 711
711 ÷ 255 = 2.788235294117647
2.788235294117647 x 100 = 278.82%