During August, 2010, Joe's Supply Store generated revenues of $30,000, the company's expenses were as follows: cost of goods sold of $12,000 and operating expenses of $2,000, The company also had rent revenue of $500 and a gain on the sale of a delivery truck of $1,000, Joe's gross profit for August, 2010 is O a. $30,000 O b. $16,000 O c $19,000 O d. $18,000