280.86% is the change from 256 to 975
Calculation steps:
[( 975 - 256 ) ÷ 256] x 100 = 280.86%
Formula
Percentage change = [(975 - 256) / 256] x 100
Subtract the new number by the original number
975 - 256 = 719
719 ÷ 256 = 2.80859375
2.80859375 x 100 = 280.86%