please explain. thanks!

Darlington Company experienced the following business events during its first month of operations. The company uses the perpetual Inventory system. 1) The company purchased $12,800 of merchandise on account under terms 4/10,n/30. 2) The company returned $1,500 of merchandise to the supplier before payment was made. 3) The liability was paid within the discount period. 4) All of the merchandise purchased was sold for $19,400 cash. What is the gross margin that results from these four transactions? Mutiple Choice 58.552 $6,600 $10,848 55300