Apply the AVCO method of inventory valuation on the following information, first in periodic inventory system, and then in perpetual inventory system to determine the value of inventory on hand on March 31 and the cost of goods sold:

March 01: beginning inventory: 60 units @ $15 per unit

March 05: purchase of 140 units @ $15.50 per unit

March 14: sale of 190 units @ $19 per unit

March 27: purchase of 70 units @ $16 per unit

March 29: sale of 30 units @ $19.50 per unit