2238.89% is the change from 18 to 421
Calculation steps:
[( 421 - 18 ) ÷ 18] x 100 = 2238.89%
Formula
Percentage change = [(421 - 18) / 18] x 100
Subtract the new number by the original number
421 - 18 = 403
403 ÷ 18 = 22.38888888888889
22.38888888888889 x 100 = 2238.89%