-45.13% is the change from 800 to 439
Calculation steps:
[( 439 - 800 ) ÷ 800] x 100 = -45.13%
Formula
Percentage change = [(439 - 800) / 800] x 100
Subtract the new number by the original number
439 - 800 = -361
-361 ÷ 800 = -0.45125
-0.45125 x 100 = -45.13%