3488.89% is the change from 18 to 646
Calculation steps:
[( 646 - 18 ) ÷ 18] x 100 = 3488.89%
Formula
Percentage change = [(646 - 18) / 18] x 100
Subtract the new number by the original number
646 - 18 = 628
628 ÷ 18 = 34.888888888888886
34.888888888888886 x 100 = 3488.89%