-50.25% is the change from 804 to 400
Calculation steps:
[( 400 - 804 ) ÷ 804] x 100 = -50.25%
Formula
Percentage change = [(400 - 804) / 804] x 100
Subtract the new number by the original number
400 - 804 = -404
-404 ÷ 804 = -0.5024875621890548
-0.5024875621890548 x 100 = -50.25%