Brown Inc. uses the perpetual inventory system, and recorded the following data pertaining to raw material X during January 2020: Date Units Received Unit Cost Units Sold Units on Hand $4.00 3,200 Jan 1 Inventory Jan 11 Sold 1,600 1,600 Purchase Jan 22 4,000 $4.70 5,600 The moving average unit cost of raw material X inventory at January 31, 2020 is