-49.7% is the change from 839 to 422
Calculation steps:
[( 422 - 839 ) ÷ 839] x 100 = -49.7%
Formula
Percentage change = [(422 - 839) / 839] x 100
Subtract the new number by the original number
422 - 839 = -417
-417 ÷ 839 = -0.4970202622169249
-0.4970202622169249 x 100 = -49.7%