-50.06% is the change from 851 to 425
Calculation steps:
[( 425 - 851 ) ÷ 851] x 100 = -50.06%
Formula
Percentage change = [(425 - 851) / 851] x 100
Subtract the new number by the original number
425 - 851 = -426
-426 ÷ 851 = -0.500587544065805
-0.500587544065805 x 100 = -50.06%