388.89% is the change from 18 to 88
Calculation steps:
[( 88 - 18 ) ÷ 18] x 100 = 388.89%
Formula
Percentage change = [(88 - 18) / 18] x 100
Subtract the new number by the original number
88 - 18 = 70
70 ÷ 18 = 3.888888888888889
3.888888888888889 x 100 = 388.89%