1987.5% is the change from 40 to 835
Calculation steps:
[( 835 - 40 ) ÷ 40] x 100 = 1987.5%
Formula
Percentage change = [(835 - 40) / 40] x 100
Subtract the new number by the original number
835 - 40 = 795
795 ÷ 40 = 19.875
19.875 x 100 = 1987.5%
Example