41900% is the change from 2 to 840
Calculation steps:
[( 840 - 2 ) ÷ 2] x 100 = 41900%
Formula
Percentage change = [(840 - 2) / 2] x 100
Subtract the new number by the original number
840 - 2 = 838
838 ÷ 2 = 419
419 x 100 = 41900%
Example