505.56% is the change from 18 to 109
Calculation steps:
[( 109 - 18 ) ÷ 18] x 100 = 505.56%
Formula
Percentage change = [(109 - 18) / 18] x 100
Subtract the new number by the original number
109 - 18 = 91
91 ÷ 18 = 5.055555555555555
5.055555555555555 x 100 = 505.56%