$4.$ Electronics Repsir Shop Problem: $(20$ points$)$

You've been hired as a consultant for a local eiectronics repair shop calied 'Techfic'. They specialise in repairing smartphones and laptops. TechFix has a $2-$step process. When a repsir arrives, they first go through a diagnostic process where a diagnostic technician evaluates the needed repairs and estimates the cost of the repairs. The second step is to go to the appropriate repair station. They neve a repair station for Smartphones that is staffed by a Smartphone Repair Technician, and they have a repair station for Laptops that is staffed by a Laptop Repair Technician.

The shop is open $7$ days a week from $9$:$00$ AM $-7$:$00$ FM$.$ On werage $1$ repair order arrives per hour during this time. During this $10-$hour period, the shop is staffed by $1$ Diagnostic Technician, $1$ Laptop Repair Technicion, and $15$ martphone Repsir Technician. At the end of the day, if a technician is warking on a repair, the work will be preempted and started again the next dey. $($Hint: use the preempt Schedule Rule in your model.$)$

Of the repairs that come in$,$ roughily haif of them are for Smartphones and the other half are for Laptops. Of the smartphane repairs, $\backslash (60\backslash \%\backslash )$ are minor and $\backslash (40\backslash \%\backslash )$ are major repairs. Of the laptop repairs, $\backslash (30\backslash \%\backslash )$ are minor and $\backslash (70\backslash \%\backslash )$ are major repairs. The service times are at each step in the process listed below.

Run the model for $30$ days and $100$ replications. Use a base time unit of hours. Keep track of the time that a smartphone and laptop are in the system $($including the overnight hours.$)$ For example, if a smartphone comes in at $10$:$00$ AM on Monday and is finished at $11$:$00$ AM on Tuescery, it would heve been in the system for $25$ nours.

Round all answers to $2$ decimal places.

$3.$ Fill in the following table: