Periodic Inventory by Three Methods The units of an item available for sale during the year were as follow Jan. 1 Inventory 1,040 units $130 Feb. 17 Purchase 1.410 units 5132 Jul 21 Purchase 1.630 units $134 Nov. 23 Purchase 1.135 units $136 There are 1.210 units of the item in the physical inventory at December 31 The periodic Inventory system ud. Do not round intermediate calculation and round final answer to nearest whole value a. Determine the inventory cost by the first in, first-out method. b. Determine the inventory cost by the lastin, fistut method. c. Determine the inventory cost by the weighted average cost method