During August, 2014, Joe's Supply Store Generated Revenues of $90,000

During August, 2014, Joe's Supply Store generated revenues of $90,000. The company's expenses were as follows: cost of goods sold of $36,000 and operating expenses of $6,000. The company also had rent revenue of $1,500 and a gain on the sale of a delivery truck of $3,000. Joe's gross profit for August, 2014 is

A) $90,000.
B) $57,000.
C) $54,000.
D) $48,000.