-49.94% is the change from 799 to 400
Calculation steps:
[( 400 - 799 ) ÷ 799] x 100 = -49.94%
Formula
Percentage change = [(400 - 799) / 799] x 100
Subtract the new number by the original number
400 - 799 = -399
-399 ÷ 799 = -0.49937421777221525
-0.49937421777221525 x 100 = -49.94%