Posh Nails   Katie Posh runs an upscale nail salon. The service process includes five activities that are conducted in the sequence...

Posh Nails

Katie Posh runs an upscale nail salon. The service process includes five activities that are conducted in the sequence described below. (The time required for each activity is shown in parentheses):

Activity1:Welcomea guest. (1minute)

Activity2:Clip and filenails. (3minutes)

Activity3:Paint. (5minutes)

Activity4: Dry.  (10minutes)

Activity5: Check out thecustomer. (4minutes)

Three servers (S1, S2, and S3) offer the services in a worker-­‐paced line. The assignment of tasks to serversis thefollowing:

S1 does Activity1.

S2doesActivities2and 3.

S3 does Activities 4 and 5.

Thedryingprocessdoesnot requireserver3’sconstantattention;she/heneedsto onlyescort thecustomerto thesalon’sdryingchair(equippedwithfans fordrying).Thetimeto do this is negligible. Thereexists only one dryingchair in the salon.

PN1.Which resource is the bottleneck of the process?

PN2.What is the utilization of server2? Assume that there is unlimited demand and that the process only admits customers at therate of the bottleneck.

PN3.What is theaveragelabour utilization of the servers? Assume that there is unlimited demand and that the process only admits customers at therate of the bottleneck.

PN4.Assume a wagerate of $12 per hour. What are the direct labourcosts for onecustomer?