2010% is the change from 40 to 844
Calculation steps:
[( 844 - 40 ) ÷ 40] x 100 = 2010%
Formula
Percentage change = [(844 - 40) / 40] x 100
Subtract the new number by the original number
844 - 40 = 804
804 ÷ 40 = 20.1
20.1 x 100 = 2010%
Example