Note: You will not get full credits without your calculation or analysis. Each problem is worth $3$ points.

A photo studio with a single photographer offers both individual and group portrait options. All customers must register first with their phones $(2$ minutes$).$ The customers then proceed to one of two cashiers where they decide upon two photo package options. One cashier is more experienced and processes a customer in $10$ minutes, while the other cashier takes $12$ minutes. Then, depending on if the customer wants an individual or group portrait, they go to different rooms. An individual portrait takes $15$ minutes, and a group portrait takes $20$ minutes. Finally, everyone picks up their own finished portraits $(6$ minutes$).$ Assume that each process results in one unit of output.

Draw a flow chart to depict the photo studio's process.

What is the maximum throughput time for a customer without considering waiting?

Which process is the bottleneck for the entire process, assuming the process receives equal amounts of both groups and individuals?

If $75\%$ of customers want group portraits and $25\%$ want individual portraits, what is the average capacity of the photo studio?