Problem $2.($pp$\mathrm{.}76)$

$2\mathrm{.}18$ A part requires three processing steps on two machines in the sequence A$-$B$-$A$.$ The demand for this part is $10,000$ units per year. The company operates six days per week, eight hours per day. Given the following performance data, find the number of each machine needed to meet the demand.

$\backslash$table$[[$Operation$,$Machine,Standard Time,Efficiency,Reliability,Defects$],[1,$A$,7$ min,$99\%,95\%,4\%$