-45% is the change from 800 to 440
Calculation steps:
[( 440 - 800 ) ÷ 800] x 100 = -45%
Formula
Percentage change = [(440 - 800) / 800] x 100
Subtract the new number by the original number
440 - 800 = -360
-360 ÷ 800 = -0.45
-0.45 x 100 = -45%
Example