3350% is the change from 20 to 690
Calculation steps:
[( 690 - 20 ) ÷ 20] x 100 = 3350%
Formula
Percentage change = [(690 - 20) / 20] x 100
Subtract the new number by the original number
690 - 20 = 670
670 ÷ 20 = 33.5
33.5 x 100 = 3350%
Example