3600% is the change from 18 to 666
Calculation steps:
[( 666 - 18 ) ÷ 18] x 100 = 3600%
Formula
Percentage change = [(666 - 18) / 18] x 100
Subtract the new number by the original number
666 - 18 = 648
648 ÷ 18 = 36
36 x 100 = 3600%
Example