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A machine shop has just received a rush order for 6,000 repair kits that will be needed to satisfy recall notice for a major appliance manufacturer. The order must be shipped to the customer in 15 working days from now. The order is in addition to the machine shop's normal workload, so additional machinists will have to be hired, or the existing labor force of 25 machinists will have to work overtime. If additional machinists are hired, they must be trained before they can do production work. Training takes 3 work days. When the order is shipped, the new hires will probably be laid off when the shop reverts back as regular workload. If the existing labor force is asked to work overtime, they must be paid time-and-a-half, and they are limited to a maximum of 3 overtime hr/day and 6 hr on Saturdays (there are only three Saturdays before order must be shipped). The repair kits consist of two machined parts with standard times of 5.65 min and 3.54 min. The two parts are then packaged (standard time = 1.91 min) using packing materials supplied by the appliance maker. If new machinists are hired, how many are needed to complete the order? O 12 workers 9 workers 18 workers 15 workers