-50% is the change from 852 to 426
Calculation steps:
[( 426 - 852 ) ÷ 852] x 100 = -50%
Formula
Percentage change = [(426 - 852) / 852] x 100
Subtract the new number by the original number
426 - 852 = -426
-426 ÷ 852 = -0.5
-0.5 x 100 = -50%
Example