-50% is the change from 802 to 401
Calculation steps:
[( 401 - 802 ) ÷ 802] x 100 = -50%
Formula
Percentage change = [(401 - 802) / 802] x 100
Subtract the new number by the original number
401 - 802 = -401
-401 ÷ 802 = -0.5
-0.5 x 100 = -50%
Example