55.9% is the change from 161 to 251
Calculation steps:
[( 251 - 161 ) ÷ 161] x 100 = 55.9%
Formula
Percentage change = [(251 - 161) / 161] x 100
Subtract the new number by the original number
251 - 161 = 90
90 ÷ 161 = 0.5590062111801242
0.5590062111801242 x 100 = 55.9%