Every year, Corinna Paolucci sells 30,000 cases of her Famous Spaghetti Sauce. It costs her $\$ 1$ per year in electricity to store a case, plus she must pay annual warehouse fees of $\$ 2$ per case for the maximum number of cases she will store. If it costs her $\$ 750$ to set up a production run, plus $\$ 8$ per case to manufacture a single case, how many production runs should she have each year to minimize her total costs? (See Exercise 17.)