Based on Jacobs (1954). The Carter Caterer Company must have the following number of clean napkins available at the beginning of each of the next 4 days:

day 1, 1500; day 2, 1200; day 3, 1800; day 4, 600.

After being used, a napkin can be cleaned by one of two methods: fast service or slow service. Fast service costs 10 cents per napkin, and a napkin cleaned via fast service is available for use the day after it is last used. Slow service costs 6 cents per napkin, and these napkins can be reused 2 days after they are last used.

New napkins can be purchased for a cost of 20 cents per napkin. Determine how to minimize the cost of meeting the demand for napkins during the next 4 days. (Note: There are at least two possible modeling approaches, one network and one nonnetwork.

See if you can model it each way.)