1940% is the change from 40 to 816
Calculation steps:
[( 816 - 40 ) ÷ 40] x 100 = 1940%
Formula
Percentage change = [(816 - 40) / 40] x 100
Subtract the new number by the original number
816 - 40 = 776
776 ÷ 40 = 19.4
19.4 x 100 = 1940%
Example