The highest value of total cost was $78,000 in June for AcaiBeverages, Inc. Its lowest value of total cost was $60,000 in December. The company makes a single product. The production volume in June and December were 13000 and 6,000 units, respectively. What is the variable cost permonth? (Round your answer to the nearestcent.)

A.$3.00 per unit

B.$2.57 per unit

C.$1.38 per unit

D.$11.14 per unit