5400% is the change from 18 to 990
Calculation steps:
[( 990 - 18 ) ÷ 18] x 100 = 5400%
Formula
Percentage change = [(990 - 18) / 18] x 100
Subtract the new number by the original number
990 - 18 = 972
972 ÷ 18 = 54
54 x 100 = 5400%
Example