As at 31 December 2018, ABC Limited ("ABC") had a net balance of accounts receivable of $9,000, representing a gross amount of $9,100 due from a customer, BBA Limited ("BBA"), less the allowance for doubtful accounts of $100. Closing inventory of $3,000 was held as at 31 December 2018 (being 100 units at $30 each). Market value of the inventory was estimated to be well-above the costs. On 5 January 2019, ABC purchased 300 units of inventories at $32 each and paid by cash. On 10 January 2019, ABC sold 150 units of goods to BBA for a gross price of $6,000 in total. This was a credit sale with terms 2/10, n/30. ABC adopts gross method in accounting for cash discount. On 25 January 2019, ABC collected $15,100 from BBA for all the amounts due. Question For the month ended 31 January 2019, how much "net sales" shall be reported by ABC