1900% is the change from 34 to 680
Calculation steps:
[( 680 - 34 ) ÷ 34] x 100 = 1900%
Formula
Percentage change = [(680 - 34) / 34] x 100
Subtract the new number by the original number
680 - 34 = 646
646 ÷ 34 = 19
19 x 100 = 1900%
Example