Baxter owns a restaurant. He is very careful to keep the cost of ingredients to 20% of sales. He issues no credit to customers, everyone pays before they leave. The restaurant maintains on average one week's worth of inventory. Every Monday he totals up his take for the previous week and pays out his suppliers. For the past four Mondays he paid out $580, $490, $610 and $440. If his fixed costs are $1000 per week, how much did he make that month in sales, and how much was left over in net income for him as the owner?