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 dollar, what should be the total cost of operating the helpline costs at a volume of 31,200 calls in a month? (Assume that this call volume is within the relevant range.)

A) $171,100
B) $177,590
C) $184,080
D) $159,035