1338.89% is the change from 18 to 259
Calculation steps:
[( 259 - 18 ) ÷ 18] x 100 = 1338.89%
Formula
Percentage change = [(259 - 18) / 18] x 100
Subtract the new number by the original number
259 - 18 = 241
241 ÷ 18 = 13.38888888888889
13.38888888888889 x 100 = 1338.89%