3494.44% is the change from 18 to 647
Calculation steps:
[( 647 - 18 ) ÷ 18] x 100 = 3494.44%
Formula
Percentage change = [(647 - 18) / 18] x 100
Subtract the new number by the original number
647 - 18 = 629
629 ÷ 18 = 34.94444444444444
34.94444444444444 x 100 = 3494.44%