During October, Tedesco Company sold 240 unit of product R. It's beginning inventory and purchases during the month were as follows:

Oct 1	Beginning inventory	100 units @ $20
Oct 5	Purchases	100 units @ $24
Oct 10	Purchases	100 units @ $22
Oct 15	Purchases	100 @ $24
Oct 20	Purchases	100 units @ $28
Oct 25	Purchases	100 units @ $26

Compute the cost of goods sold under each of three methods: a. Average cost, b. LIFO and c. FIFO. Assume the periodic inventory system is used.