In the following situation, should one machine be purchased and operated 24hours a day, or should three machines be bought and operated 8 hours?

1-The machine cost $ 120000 with an economic life of 10 years.

2-The 24 operation is really only 95% efficiency because of maintenance and repair activities.

3-Labor is paid in full no matter how many hours they work in each shift.

4-First shift operators get $ 12, second shift operators get $ 14, and third shift operators get $ 16.5 per hour.

With regular one-shift production, the company does not pay for lunch so it gets 8 hours' work for 8 hours' pay.

Since the plan is to work 6 days a week, what action would you take? Discuss your findings.

notes

I want the answer in details

and Not on an excel sheet