40400% is the change from 2 to 810
Calculation steps:
[( 810 - 2 ) ÷ 2] x 100 = 40400%
Formula
Percentage change = [(810 - 2) / 2] x 100
Subtract the new number by the original number
810 - 2 = 808
808 ÷ 2 = 404
404 x 100 = 40400%
Example