42000% is the change from 2 to 842
Calculation steps:
[( 842 - 2 ) ÷ 2] x 100 = 42000%
Formula
Percentage change = [(842 - 2) / 2] x 100
Subtract the new number by the original number
842 - 2 = 840
840 ÷ 2 = 420
420 x 100 = 42000%
Example