Assume Beta Company uses the perpetual inventory method and engaged in the following transactions: 1) Purchased $6,000 of merchandise on account under terms 4/10,n/30. 2) Returned $600 (list price) of merchandise to the supplier before payment was made. 3) Paid the account payable within the discount period. 4) Sold the merchandise for $7,800 cash. The amount of gross margin from the four transactions is $1,800 $1,584 $2,640 $2,616. O MacBook Air AN W