Quick Connect manufactures high-tech cell phones.Quick Connect has a policy of adding a 25% markup to full costs and currently has excess capacity. The following information pertains to the company's normal operations per month:

Output units 1,500 phones

Machine-hours 1,100 hours

Direct manufacturing labor-hours 1,200 hours

Direct materials per unit $23

Direct manufacturing labor per hour $9

Variable manufacturing overhead costs $214,500

Fixed manufacturing overhead costs $126,700

Product and process design costs $143,400

Marketing and distribution costs $154,045

Quick Connect Products is approached by an overseas customer to fulfill a one-time-only special order for 150 units. All cost relationships remain the same except for a one-time setup charge of $2,025. No additional design, marketing, or distribution costs will be incurred. What is the minimum acceptable bid per unit on this one-time-only special order?

A. $188.50

B. $173.20.

C. $30.20

D. $186.70 [correct answer]

I know that D. is the correct answer, but I don't know how to get there. Please explain? Thank you!