Part 1: Last month, during the three-hour period between 12 noon and 3 pm, a customer service call center that uses eight customer service representatives (CSRs) handled an average of 408 calls from customers. This equated to a labor utilization rate of 85%. What was the average service rate in minutes, i.e., what is the average number of minutes each CSR spent on a phone call?

A: 2 MIN

B: 3 MIN

C: 4 MIN

D: 6 MIN

Part Two: If the labor utilization rate increases to 90% and the service rate stays the same, how many more call would the call center be able to handle between 12 and 3 pm?

A: 3 more calls

B: 8 more calls

C: 18 more calls

D: 24 more calls