42150% is the change from 2 to 845
Calculation steps:
[( 845 - 2 ) ÷ 2] x 100 = 42150%
Formula
Percentage change = [(845 - 2) / 2] x 100
Subtract the new number by the original number
845 - 2 = 843
843 ÷ 2 = 421.5
421.5 x 100 = 42150%
Example