-50.3% is the change from 847 to 421
Calculation steps:
[( 421 - 847 ) ÷ 847] x 100 = -50.3%
Formula
Percentage change = [(421 - 847) / 847] x 100
Subtract the new number by the original number
421 - 847 = -426
-426 ÷ 847 = -0.5029515938606848
-0.5029515938606848 x 100 = -50.3%