2400% is the change from 34 to 850
Calculation steps:
[( 850 - 34 ) ÷ 34] x 100 = 2400%
Formula
Percentage change = [(850 - 34) / 34] x 100
Subtract the new number by the original number
850 - 34 = 816
816 ÷ 34 = 24
24 x 100 = 2400%
Example