455.56% is the change from 18 to 100
Calculation steps:
[( 100 - 18 ) ÷ 18] x 100 = 455.56%
Formula
Percentage change = [(100 - 18) / 18] x 100
Subtract the new number by the original number
100 - 18 = 82
82 ÷ 18 = 4.555555555555555
4.555555555555555 x 100 = 455.56%