C&A Fast Food has four activities in serving a customer: greet customer, take order, process order, and deliver order. Each activity is staffed by one employee (for a total of four employees). The processing time for each activity is given as follows:

Activity
Processing time per customer
Wage rate
($ Per hour)
Greet customer
2 seconds
5
Take order
30 seconds
5
Process order
60 seconds
15
Deliver order
5 seconds
8

Assume demand is unlimited. If one additional employee is added to the bottleneck activity, what will be the cost of direct labor in $ per customer？

A.0.275
B.0.3125
C.0.40
D.
0.50