54.22% is the change from 166 to 256
Calculation steps:
[( 256 - 166 ) ÷ 166] x 100 = 54.22%
Formula
Percentage change = [(256 - 166) / 166] x 100
Subtract the new number by the original number
256 - 166 = 90
90 ÷ 166 = 0.5421686746987951
0.5421686746987951 x 100 = 54.22%