40950% is the change from 2 to 821
Calculation steps:
[( 821 - 2 ) ÷ 2] x 100 = 40950%
Formula
Percentage change = [(821 - 2) / 2] x 100
Subtract the new number by the original number
821 - 2 = 819
819 ÷ 2 = 409.5
409.5 x 100 = 40950%
Example