-49.88% is the change from 800 to 401
Calculation steps:
[( 401 - 800 ) ÷ 800] x 100 = -49.88%
Formula
Percentage change = [(401 - 800) / 800] x 100
Subtract the new number by the original number
401 - 800 = -399
-399 ÷ 800 = -0.49875
-0.49875 x 100 = -49.88%