(Chapter 7 Process Interruptions ) Galactica makes camera housings used in satellites. Galactica's process begins with a Computer Numerically Controlled (CNC) machine that drills into a block of metal to make the camera housing. The CNC machine requires a 30 minute setup time before the production of a batch of camera housings can commence. Each block requires 10 minutes of drilling on the CNC machine.

Next, the batch of camera housings are chemically treated in a series of baths. There is unlimited capacity in the treating stage.

Finally, a worker must manually attach the various buttons and components to the metal housing. The assembly takes 120 minutes per housing per worker, no setups, and Galactica has 6 workers trained to do this task.

Assume unlimited demand. The process is shown below. Note there are buffers between the stages of the process.

Drilling on CNC machine ===> Chemical Treatment====> Assembly

If the batch size is 30 housings, what would be the CNC machine's approximate capacity (in housings per hour)?

Group of answer choices

8.5 housings per hour

16.5 housings per hour

5.5 housings per hour

3 housings per hour