Fresh out of college, Monica Larsen's first assignment in her new job as a purchasing agent at Aggie Gifts was to decide whether to continue to purchase a boxed pen set from an existing supplier or consider a proposal from a new supplier. She also had to evaluate whether current purchasing practices were effective. Aggie Gifts bought pen sets from Pens for You for $$21/$set$.$ Pens for You shipped products from its factory in China with a delivery lead time of six weeks, charging a processing fee of $$150/$order$.$ The lead time for Pens for You showed a standard deviation of $1\mathrm{.}2$ weeks. However, Penultimate, a relative newcomer to the industry, had offered a similar set that it produced in the U$.$S$.$ but cost $$28/$set$.$ Penultimate however promised four week delivery and charged only $$125/$order$.$ The lead time for Penultimate also showed a standard deviation of $1\mathrm{.}2$ weeks.