216.05% is the change from 81 to 256
Calculation steps:
[( 256 - 81 ) ÷ 81] x 100 = 216.05%
Formula
Percentage change = [(256 - 81) / 81] x 100
Subtract the new number by the original number
256 - 81 = 175
175 ÷ 81 = 2.1604938271604937
2.1604938271604937 x 100 = 216.05%