-50% is the change from 844 to 422
Calculation steps:
[( 422 - 844 ) ÷ 844] x 100 = -50%
Formula
Percentage change = [(422 - 844) / 844] x 100
Subtract the new number by the original number
422 - 844 = -422
-422 ÷ 844 = -0.5
-0.5 x 100 = -50%
Example