2012.5% is the change from 40 to 845
Calculation steps:
[( 845 - 40 ) ÷ 40] x 100 = 2012.5%
Formula
Percentage change = [(845 - 40) / 40] x 100
Subtract the new number by the original number
845 - 40 = 805
805 ÷ 40 = 20.125
20.125 x 100 = 2012.5%
Example