Mire Corporation Staffs a Helpline to Answer Questions from Customers

Multiple Choice

Mire Corporation staffs a helpline to answer questions from customers. The costs of operating the helpline are variable with respect to the number of calls in a month. At a volume of 29,000 calls in a month, the costs of operating the helpline total $171,100.
-To the nearest whole cent, what should be the average cost of operating the helpline per call at a volume of 27,500 calls in a month? (Assume that this call volume is within the relevant range.)

A) $5.48
B) $5.90
C) $6.22
D) $6.06