200% is the change from 18 to 54
Calculation steps:
[( 54 - 18 ) ÷ 18] x 100 = 200%
Formula
Percentage change = [(54 - 18) / 18] x 100
Subtract the new number by the original number
54 - 18 = 36
36 ÷ 18 = 2
2 x 100 = 200%
Example