280.08% is the change from 256 to 973
Calculation steps:
[( 973 - 256 ) ÷ 256] x 100 = 280.08%
Formula
Percentage change = [(973 - 256) / 256] x 100
Subtract the new number by the original number
973 - 256 = 717
717 ÷ 256 = 2.80078125
2.80078125 x 100 = 280.08%