-43.75% is the change from 800 to 450
Calculation steps:
[( 450 - 800 ) ÷ 800] x 100 = -43.75%
Formula
Percentage change = [(450 - 800) / 800] x 100
Subtract the new number by the original number
450 - 800 = -350
-350 ÷ 800 = -0.4375
-0.4375 x 100 = -43.75%