-50% is the change from 834 to 417
Calculation steps:
[( 417 - 834 ) ÷ 834] x 100 = -50%
Formula
Percentage change = [(417 - 834) / 834] x 100
Subtract the new number by the original number
417 - 834 = -417
-417 ÷ 834 = -0.5
-0.5 x 100 = -50%
Example