Hello there!
[tex] \frac{40 - 160}{160} (100) \\ \\ \\ 40 - 160 = -120 \\ \\ 160 = 160 \\ \\ \\ Problem: \frac{-120}{160} (100) \\ \\ \\ \frac{-120}{160} = -0.75 \\ \\ Problem: -0.75(100) = -75[/tex]
Therefore, it [tex]decreased [/tex] by [tex]75[/tex]%
Good luck on your assignment and enjoy your day
~ [tex]MeIsKaitlyn:)[/tex]