220.31% is the change from 256 to 820
Calculation steps:
[( 820 - 256 ) ÷ 256] x 100 = 220.31%
Formula
Percentage change = [(820 - 256) / 256] x 100
Subtract the new number by the original number
820 - 256 = 564
564 ÷ 256 = 2.203125
2.203125 x 100 = 220.31%