42.58% is the change from 155 to 221
Calculation steps:
[( 221 - 155 ) ÷ 155] x 100 = 42.58%
Formula
Percentage change = [(221 - 155) / 155] x 100
Subtract the new number by the original number
221 - 155 = 66
66 ÷ 155 = 0.4258064516129032
0.4258064516129032 x 100 = 42.58%