2015% is the change from 40 to 846
Calculation steps:
[( 846 - 40 ) ÷ 40] x 100 = 2015%
Formula
Percentage change = [(846 - 40) / 40] x 100
Subtract the new number by the original number
846 - 40 = 806
806 ÷ 40 = 20.15
20.15 x 100 = 2015%
Example