The following units of an inventory item were available for sale during the year: Beginning inventory8 units at $50 First purchase Second purchase Third purchase The firm uses the periodic inventory system. During the year, 23 units of the item were sold The value of ending inventory rounded to the nearest dollar using average cost is (Round average cost per unit to three decimal place.) 19 units at $52 28 units at $54 18 units at $56 a. $1,278 b. $1,150 C. $2,677 d.$1,180