2250% is the change from 18 to 423
Calculation steps:
[( 423 - 18 ) ÷ 18] x 100 = 2250%
Formula
Percentage change = [(423 - 18) / 18] x 100
Subtract the new number by the original number
423 - 18 = 405
405 ÷ 18 = 22.5
22.5 x 100 = 2250%
Example