Solution and Explanation:
a) FIFO (First in first out method)
Of the 200 units remaining on hand, all 200 are from the last purchase.
the Ending inventory using the first in first out method
200 at the rate of $9 = $ 1,800
b) LIFO (Last in first out method)
Of the 200 units remaining on hand, all 200 are from the first purchase.
the Ending Inventory using the last in first out method
200 at the rate of $6 = $ 1,200