220% is the change from 80 to 256
Calculation steps:
[( 256 - 80 ) ÷ 80] x 100 = 220%
Formula
Percentage change = [(256 - 80) / 80] x 100
Subtract the new number by the original number
256 - 80 = 176
176 ÷ 80 = 2.2
2.2 x 100 = 220%
Example