As a result of the first week, the students are considering increasing the number of employees

serving the counter. To help to make the decision, they have learned from their marketing

professor that industry standards suggest a waiting customer costs a company $$7\mathrm{.}50/$hour;

they have also determined that each additional employee will actually increase service time

by half a minute. Employees are paid $$15/$ hour.

e$)$ Determine the total hourly cost at the current level $(5$ employees$)$ and with additional

employees. How many employees minimize total cost?

f$)$ Recalculate the performance measures of a$),$ b$),$ c$)$ and d$)$ with the number of employees

recommended in part e$).$ What do you notice about the new performance measures?