181.32% is the change from 91 to 256
Calculation steps:
[( 256 - 91 ) ÷ 91] x 100 = 181.32%
Formula
Percentage change = [(256 - 91) / 91] x 100
Subtract the new number by the original number
256 - 91 = 165
165 ÷ 91 = 1.8131868131868132
1.8131868131868132 x 100 = 181.32%