Todrick Company is a merchandiser that reported the following information based on $1,000$ units sold:

Sales$-$$$180,000$

Beginning merchandise inventory$-$$ $12,000$

Purchases$-$$$120,000$

Ending merchandise inventory$-$$ $6,000$

Fixed selling expense?

Fixed administrative expense$-$$$7,200$Variable selling expense$-$$$9,000$Variable administrative expense?Contribution margin$-$$$36,000$

Net operating income$-$ $$10,800$