281.64% is the change from 256 to 977
Calculation steps:
[( 977 - 256 ) ÷ 256] x 100 = 281.64%
Formula
Percentage change = [(977 - 256) / 256] x 100
Subtract the new number by the original number
977 - 256 = 721
721 ÷ 256 = 2.81640625
2.81640625 x 100 = 281.64%