$1.$ If Coffee Bloom Caf$,$ Inc. expects to sell $12,000$ units, which option should they take? Show your work to calculate total costs in the answer.

$2.$ If Coffee Bloom Caf$,$ Inc. expects to sell $8,000$ units, which option should they take? Show your work to calculate total costs in the answer.

$3.$ Develop a decision rule that specifies which option to take for different levels of unit. Hint: Review Example $7\mathrm{.}1$ in textbook and PPT slides. The video lecture $[2]$ demonstrates how to create a graph and comment about graph.