Bell Corporation sold merchandise on account with a list price of $18,000 and a cost of $10,000. Payment terms were 1/10, n/30. Bell shipped the goods FOB destination and paid $600 in freight costs. Prior to payment of the invoice, the customer returned merchandise with a list price of $1,800 and a $1,000 cost. The customer paid the amount due within the discount period. What is Bell Corporation's net sales amount as a result of these transactions?

a)

$15,438

b)

$16,038

c)

$17,220

d)

$17,820