538.89% is the change from 18 to 115
Calculation steps:
[( 115 - 18 ) ÷ 18] x 100 = 538.89%
Formula
Percentage change = [(115 - 18) / 18] x 100
Subtract the new number by the original number
115 - 18 = 97
97 ÷ 18 = 5.388888888888889
5.388888888888889 x 100 = 538.89%