Problem $12-34($Static$)$

Demand for doughnut holes on Saturdays at Don's Doughnut Shoppe is shown in the following table.

Click here for the Excel Data File

a$-1.$ Determine the optimal number of doughnut holes, in dozens, to stock if labor, materials, and overhead are estimated to be $$3\mathrm{.}20$

per dozen, doughnut holes are sold for $$4\mathrm{.}80$ per dozen, and leftover doughnut holes at the end of each day are sold the next day at

half price. $($Round your answer to the nearest whole number.$)$

a$-2.$ What is the resulting service level? $($Round your answer to $2$ decimal places.$)$