Calculating Cost Of Goods Sold and End Inventory

Katy Company's record of transactions concerning part X for the month was as follows Purchases Sales Quantity: Unit Cost Apr 1 Apr 4 Apr 11 Apr 18 110 420 280 210 Quantity 290 200 300 (Balance on hand) $8.00 Apr 5 8.20Apr 12 8.30 Apr 27 8.40 (b) If the perpetual inventory record is kept: (1) First-in, First-out, (FIFO) (2) Last-in, First-out, (LIFO) (3) Average Cost