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You and your roommate have timed the necessary physical operations. The first physical production step is to wash out the mixing bowl from the previous batch, add all of the ingredients, and mix them in your food processor. The mixing bowls hold ingredients for up to three dozen cookies. You then dish up the cookies, one dozen at a time, onto a cookie tray. These activities take six minutes for the washing and mixing steps, regardless of how many cookies are being made in the batch. That is, to mix enough dough and ingredients for three dozen cookies takes the same six minutes as one dozen cookies. However, dishing up the cookies onto the tray takes two minutes per tray. The next step, performed by your roommate, is to put the cookies in the oven and set the thermostat and timer, which takes about one minute. The cookies bake for the next 9 minutes. So total baking time is 10 minutes, during the first minute of which your roommate is busy setting the oven. Because the oven only holds one tray, a second dozen takes an additional 10 minutes to bake.
Your roommate also performs the last steps of the process by first removing the cookies from the oven and putting them aside to cool for five minutes, then carefully packing them in a box and accepting payment. Removing the cookies from the oven takes only a negligible amount of time, but it must be done promptly. It takes two minutes to pack each dozen and about one minute to accept payment for the order.
Baking trays hold exactly one dozen cookies, you will produce and sell cookies by the dozen. Should you give any discount for people who order two dozen cookies, three dozen cookies, or more? If so, how much? Will it take you any longer to fill a two-dozen order than a one-dozen order?

Note: Here are my answer.
Since the packaging and ingredient cost are the same it doesn’t matter if one buys 1,2 or 3 dozen what differs is the time.

I don’t know how to calculate the discount for the two dozen cookies, three dozen cookies, or more.

  • Math -

    Also, would the number of trays and mixers needed be just one mixer since it is used to make 3 dozen cookies and afterward it is idle; 3 trays for the 3 dozen cookies the one mixer able to provide the dough for?

  • Math -

    In addition, how would one calculate the the amount I would be willing to pay to rent an additional oven?

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