Tom and Jerry run an ice cream business from their apartment block. They have purchased a fully automated ice cream making machine from Italy (at a $30k price tag) that they put in their basement. Tom is selling ice cream and Jerry operates the ice cream maker. Often times, however, they run out of ice cream and so Jerry suggested purchasing a second ice cream maker. Tom, however, wants to first look at the usage of the current ice cream maker and suggests an Overall Equipment Effectiveness (OEE) analysis. Preliminary data suggests that:

Jerry is not particularly skilled at programming the machine, which needs to be done when a new batch of ice cream gets made. Instead of spending a negligible time per set-up, he presently spends 20 minutes. A batch of ice cream takes 1h in the machine, once the machine is set-up.

A new batch is only started if there exists sufficient time to complete the batch the same day before 7pm (including the 20 minute set-up and the 1h production)

Jerry is fascinated by energy efficiency. So he turns the machine off when he goes home at 7pm. As a result of this, the next morning, the machine has to be cooled down to its desired operating temperature, which takes from 7am to 8am.

Jerry is also not particularly diligent at following the recipe that Tom's aunt in Italy had sent them. So roughly one quarter of the produced ice cream has to be thrown away.

Every other Friday, Jerry prefers to go surfing rather than showing up for work. On those days, the business has to stay closed.

How many good batches of ice cream are produced each day Jerry comes to work?

What is the OEE of the ice cream maker? (use 12h per day as the available time)