Consider the following batch flow process consisting of four process steps operated by Anna, Aaron, Emily and Mike. Emilys and Mikes step require setups. Assume the units in a production batch must be moved together between steps. The activity times and setup time are given below:

Process Steps operated by	Processing Time in min per unit	Setup time
Anna	6
Aaron	5
Emily	4	60
Mike	9	30

Assuming a batch size of 30 units, what is the approximate process capacity (units per hour)?

a. 6

b. 8

c. 10

d. 12

e. 14