2955.56% is the change from 18 to 550
Calculation steps:
[( 550 - 18 ) ÷ 18] x 100 = 2955.56%
Formula
Percentage change = [(550 - 18) / 18] x 100
Subtract the new number by the original number
550 - 18 = 532
532 ÷ 18 = 29.555555555555557
29.555555555555557 x 100 = 2955.56%