Problem 3: When a customer arrives at Pinkberry, an employee welcomes her and takes her order, 75% of customers order frozen yogurt, which takes 3 minutes to prepare, while the rest 25% order yogurt shake, which takes 4 minutes to process. The product is then handed over to the cashier to process the payment, which takes 2 minutes regardless of the product ordered. There are three employees at the frozen yogurt station, two at the yogurt shake
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