42450% is the change from 2 to 851
Calculation steps:
[( 851 - 2 ) ÷ 2] x 100 = 42450%
Formula
Percentage change = [(851 - 2) / 2] x 100
Subtract the new number by the original number
851 - 2 = 849
849 ÷ 2 = 424.5
424.5 x 100 = 42450%
Example