discount schedule given in Table 13.9. What is the optimum number of reams to buy at one time? Table 13.9 Quantity ordered (in reams) Price per ream (in \$) \begin{tabular}{|l|l|} \hline 0 to 499 & 10.00 \\ \hline 500 to 999 & 9.20 \\ \hline 1,000 to 1,499 & 7.20 \\ \hline 1,500+ & 5.00 \\ \hline \end{tabular}