Solve the question below in Excel. Make your Excel sheet like a template that you can use for solving similar questions. The grade is based on the functionality of the file, the accuracy of the solution, and the easy$-$to$-$use Excel sheet.

Problem:

An injector machine goes down roughly $20\%$ of the time $($the injector gums up and needs to be cleaned, a quick process$).$ One operator is assigned to service three identical such machines. Each machine can produce $100$ parts$/$hr if running properly $($i$.$e$.,$ not down$).$ The operator is paid $$10\mathrm{.}00/$hr and each machine costs $$20\mathrm{.}00/$hr to operate.

$$ How many hours are idle due to machine downtime?

$$ What is the unit cost for this operation?

$$ Is it worth hiring another operator at the same rate to assist the first operator, in case more than one machine goes down simultaneously?