Question $2$

Kelly's Service Station does a large business in tune$-$ups. Kelly's needs $300$ spark plugs per month. Each spark plug costs Kelly's $$4,$

annual holding costs are $2\%$ per plug, and reorder costs are $$15$ per order. What is the optimal order quantity of spark plugs for Kelly's?

Please "show your work" the best you are able.

Recall that $Q*=\sqrt[\phantom{2}]{\frac{2*D*C_O}{C_h}}$