14. Use this inventory information for the month of June to answer the following question.
June 1 Beginning inventory 10 units @ $120
5 Purchase 60 units @ $112
14 Sale 40 units
21 Purchase 30 units @ $116
30 Sale 28 units
Assuming that a periodic inventory system is used, what is cost of goos sold on a LIFO basis?
a) $7,696
b) $7,736
c) $3,664
d) $3,704
Any help is greatly appreciated... I don't understand these at all