3350% is the change from 18 to 621
Calculation steps:
[( 621 - 18 ) ÷ 18] x 100 = 3350%
Formula
Percentage change = [(621 - 18) / 18] x 100
Subtract the new number by the original number
621 - 18 = 603
603 ÷ 18 = 33.5
33.5 x 100 = 3350%
Example