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Dongguk uses a two-step process to make a part. The first step involves cutting with a machine that requires a 40-minute setup me before the production of each batch The ing takes or part, The ending the parts from cutting. The polishing takes 240 minutes per part. Dongguk has 3 workers for polishing. The demand rate is 3 parts per hour What is the mistory between cutting and polishing in number pf part if dongguk operates with batches of 200 parts ?