Kristen's cookie company

Solution to Kristen's Cookie Company (A)
Before answering specific questions, it is useful to make a diagram of the overall process:

Note that in this diagram, activities are arranged in columns to indicate which resources are being used. Inside each activity symbol are written the capacity (in dozens of cookies) and the cycle time (in minutes).

1. How long will it take for you to filla rush order?
Assuming this order is for one dozen cookies, we will need to do the following:
Activity | Resource | Cycle Time | Start Time | Finish Time |
Order Entry | E-mail | 0 minutes | 00:00 | 00:00 |
Wash Bowl, Mix | Self | 6 minutes | 00:00 | 06:00 |
Fill Tray | Self | 2 minutes | 06:00 | 08:00 |
Prepare Oven | Roommate | 1 minute | 08:00 | 09:00 |Bake | Oven | 9 minutes | 09:00 | 18:00 |
Remove | Roommate | 0 minutes | 18:00 | 18:00 |
Cool | None | 5 minutes | 18:00 | 23:00 |
Pack, Collect Money | Roommate | 3 minutes | 23:00 | 26:00 |
Therefore, the minimum time to fill an order is 26 minutes. We can illustrate the sequence of events with a Gantt chart:


2. ¿Cuántos pedidos podréis servir por noche(suponiendo que abrierais cuatro horas por
noche)?
Here is a Gantt chart for two batches of one dozen cookies each. It doesn't take twice as long to produce two batches as it does to produce one batch, because you can start mixing the second batch without having to wait for the whole first-batch process to be completed (you can start washing out the bowl as soon as you finish filling the tray). It ispossible to produce two batches in 36 minutes.

In general, a formula for the number of minutes to produce n one-dozen batches is given by this expression:
















3. ¿Cuánto de vuestro valiosísimo tiempo va a requerir cada pedido?
For yourself:
Activity | Cycle Time |
Wash Bowl, Mix | 6 minutes |
Fill Tray | 2 minutes |
Total | 8minutes |
For your roommate:
Activity | Cycle Time |
Prepare Oven | 1 minute |
Remove | 0 minutes |
Pack, Collect Money | 3 minutes |
Total | 4 minutes |

Esto es asumiendo q son una docena de galletas

4. Como las bandejas son de 12 «cookies», vais a vender vuestro producto por docenas. ¿Vais a dar descuentos a quien os pida 2, 3 o más docenas? Si así es, ¿cuánto?1 docena
Activity | Resource | Cycle Time | Start Time | Finish Time |
Order Entry | E-mail | 0 minutes | 00:00 | 00:00 |
Wash Bowl, Mix | Self | 6 minutes | 00:00 | 06:00 |
Fill Tray | Self | 2 minutes | 06:00 | 08:00 |
Prepare Oven | Roommate | 1 minute | 08:00 | 09:00 |
Bake | Oven | 9 minutes | 09:00 | 18:00 |
Remove | Roommate | 0 minutes |18:00 | 18:00 |
Cool | None | 5 minutes | 18:00 | 23:00 |
Pack, Collect Money | Roommate | 3 minutes | 23:00 | 26:00 |

Self | 8 |
Roommate | 4 |
Total Labor Minutes | 12 |

2 docenas
Activity | Resource | Cycle Time | Start Time | Finish Time |
Order Entry | E-mail | 0 minutes | 00:00 | 00:00 |
Wash Bowl, Mix | Self | 6 minutes | 00:00 | 06:00 |Fill Tray 1 | Self | 2 minutes | 06:00 | 08:00 |
Fill Tray 2 | Self | 2 minutes | 08:00 | 10:00 |
Prepare Oven 1 | Roommate | 1 minute | 08:00 | 09:00 |
Bake 1 | Oven | 9 minutes | 09:00 | 18:00 |
Remove 1 | Roommate | 0 minutes | 18:00 | 18:00 |
Cool 1 | None | 5 minutes | 18:00 | 23:00 |
Prepare Oven 2 | Roommate | 1 minute | 18:00 | 19:00 |Bake 2 | Oven | 9 minutes | 19:00 | 28:00 |
Remove 2 | Roommate | 0 minutes | 28:00 | 28:00 |
Cool 2 | None | 5 minutes | 28:00 | 33:00 |
Pack 1 | Roommate | 2 minutes | 23:00 | 25:00 |
Pack 2 | Roommate | 2 minutes | 33:00 | 35:00 |
Collect Money | Roommate | 1 minute | 35:00 | 36:00 |

Self | 10 |
Roommate | 7 |
Total Labor Minutes | 17 |...