The Browning Company, which uses perpetual inventory system, reports inventory information for 2020: January 1 January 10 January 17 March 22 April 15 October 15 Inventory on hand 4,000 units @$5.50 each. Sale 2,000 units @$20.00 each. Purchase 1,000 units @$6.00 each. Purchase 3,000 units @$7.00 each. Sale 1,500 units @$25.00 each. November 20 Purchase 3,000 units @$7.50 each. Sale 3,000 units @30.00 each. What is the average cost of inventory after January 17 purchase? A) $6.33 B) $5.67 C) $6.80 D) $6.57