Problem $2$: Fast$-$Food$-$Pasta

Consider the operations of a fast$-$food restaurant serving pre$-$made pasta dishes to its guests. The operation consists of four steps.

Each customer is first greeted and offered a menu and a tray, which takes $80$ seconds per customer. There is one employee at

this step.

At the second step, the customer places an order for food, which takes an average of $90$ seconds. There are two employees in

charge of taking food orders.

At the third step, the customer places an order for drinks, which takes an average of $55$ seconds. There is one employee in

charge of taking drink orders.

Finally, the fourth step is the cash register where one employee collects the necessary payments from the customer. There is

one employee at this last step who takes $40$ seconds per guest.

Demand for the restaurant is $50$ customers per hour. Employees are paid $$25$ per hour.

Question $5$

Due to a recession, demand goes down to $20$ guests per hour. What is the cost of direct labor assuming that the restaurant keeps the same staffing level of five employees?