-49.52% is the change from 834 to 421
Calculation steps:
[( 421 - 834 ) ÷ 834] x 100 = -49.52%
Formula
Percentage change = [(421 - 834) / 834] x 100
Subtract the new number by the original number
421 - 834 = -413
-413 ÷ 834 = -0.4952038369304556
-0.4952038369304556 x 100 = -49.52%