2338.89% is the change from 18 to 439
Calculation steps:
[( 439 - 18 ) ÷ 18] x 100 = 2338.89%
Formula
Percentage change = [(439 - 18) / 18] x 100
Subtract the new number by the original number
439 - 18 = 421
421 ÷ 18 = 23.38888888888889
23.38888888888889 x 100 = 2338.89%