-50.41% is the change from 847 to 420
Calculation steps:
[( 420 - 847 ) ÷ 847] x 100 = -50.41%
Formula
Percentage change = [(420 - 847) / 847] x 100
Subtract the new number by the original number
420 - 847 = -427
-427 ÷ 847 = -0.5041322314049587
-0.5041322314049587 x 100 = -50.41%