The caterer should supply 90 on Tuesday, 110 napkins on Monday, 170 on Thursday and 130 on Wednesday. Caterer originally has no napkins on hand. New napkins can be purchased for 7 cents each. Used napkins can be laundered for use next day at 4 cents/napkin or laundered for use in two days or more at 2 cents/napkin. At the end of week, all utilized napkins have no value. How can caterer meet the demands at minimal cost? Let this as transportation problem with 4 sources-new-napkin outlet and first three days' collections of used napkins.