In a job shop operation, four jobs may be performed on any of four machines. The hours required for each job on each machine are presented in the following table. The plant supervisor would like to assign jobs so that total time is minimized. Find the best solution. Which assignments should be made?

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MACHINE JOB W X Y Z A12 10 14 16 13 A15 12 13 15 12 B2 9 12 12 11 B9 14 16 18 16