I understand that the problem below is used to answer the next $5$ MC questions. Please click True.

An office supply store will begin stocking a new type of pen. Expected monthly demand is $800$ units. The store is open $300$ days a year. The supplier price schedule per pen is as follows: less than $200,$$$4\mathrm{.}0$; greater or equal to $200$ and less than $400,$ $$3\mathrm{.}8$; and greater or equal to $400,$$$3\mathrm{.}6.$ Ordering cost is $$40$ and annual holding cost is $$6$ per pen. Round your answers to zero decimal digits.

$($A$)$ True

False

Question $8$

The total cost function of this inventory problem is a:

Straight Line

Circle

Step function of parabolas