the units of available for sale during the year were

Mar 1 inventory 16 units $30 $480

June 16 Purchase 30 units $35 $1050

Not 28 purchase 45 units $39 $1755

91 units. $3285

There are 15 units of the product in the physical inventory at November 30. The periodic inventory system is used. Determine the both cost of good sold and ending inventory cost by a) FIFO b) lifo and c) average cost methods.