$1.$ If Silven buys its tubes from the outside supplier, how much of its own Chap$-$Off manufacturing costs per box will it be able to avoid?

$($Hint: You need to separate the manufacturing overhead of $$1\mathrm{.}60$ per box that is shown above into its variable and fixed components to derive the correct answer.$)$

$2.$ What is the financial advantage $($disadvantage$)$ per box of Chap$-$Off if Silven buys its tubes from the outside supplier?

$3.$ What is the financial advantage $($disadvantage$)$ in total $($not per box$)$ if Silven buys $140,000$ boxes of tubes from the outside supplier?

$4.$ Should Silven Industries make or buy the tubes?

$5.$ What is the maximum price that Silven should be willing to pay the outside supplier for a box of $24$ tubes?

$6.$ Instead of sales of $140,000$ boxes of tubes, revised estimates show a sales volume of $173,000$ boxes of tubes. At this higher sales volume, Silven would need to rent extra equipment at a cost of $$53,000$ per year to make the additional $33,000$ boxes of tubes.

Assuming that the outside supplier will not accept an order for less than $173,000$ boxes of tubes, what is the financial advantage $($disadvantage$)$ in total $($not per box$)$ if Silven buys $173,000$ boxes of tubes from the outside supplier? Given this new information, should Silven Industries make or buy the tubes?

$7.$ Refer to the data in Required $6.$ Assume that the outside supplier will accept an order of any size for the tubes'at a price of $$1\mathrm{.}20$ per box. How many boxes of tubes should Silven make? How many boxes of tubes should it buy from the outside supplier?