4. A company runs four items on the same machine. Demand and processing time for the four items are given in the table below. Setup time to prepare the machine for production of each of the items is also given in the table. The machine is available for two shifts or 840 minutes a day. The company wishes to start each day with the same item and run the same sequence each day (i.e., the number of setups each day will equal the number of lots to be run). Determine the number of times the company can run through the sequence of the four items in a day.

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ITEM PROCESSING TIME/UNIT (SECONDS) AVERAGE DEMAND (UNITS/DAY) MNOP 18 400 15 700 SETUP TIME TO RUN THE ITEM (MINUTES) 12 15 12 500 258 20 300 12