2680% is the change from 30 to 834
Calculation steps:
[( 834 - 30 ) ÷ 30] x 100 = 2680%
Formula
Percentage change = [(834 - 30) / 30] x 100
Subtract the new number by the original number
834 - 30 = 804
804 ÷ 30 = 26.8
26.8 x 100 = 2680%
Example