3420% is the change from 20 to 704
Calculation steps:
[( 704 - 20 ) ÷ 20] x 100 = 3420%
Formula
Percentage change = [(704 - 20) / 20] x 100
Subtract the new number by the original number
704 - 20 = 684
684 ÷ 20 = 34.2
34.2 x 100 = 3420%
Example