The units of an item available for sale during the year were as follows: There are 6 units of the item in the ptyylicar inveruory at December 31. The periodic inventory system is used, Phund average unit cost to the nesrest cent and finat answeis to the nearest whole-dollac if required. Determine the iventery cost by the first-ing, firs ou method. b. Determine the inventory cost by the iavt-iny first-out method c. Determine the inventory cost by the weighted averige cost method. Round average uait cost to the two decimal places, and round your finat answer to the nearest dollar. x