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 net cash flow from operating activities as a result of the four transactions is: