PLease show work and explain how to do these

Tier Il Company uses a periodic inventory system. Details for the inventory account for the month of January 2007 are as follows: Per unit price Units Total Balance, 1/1/2007 Purchase, 1/15/2007 Purchase, 1/28/2007 200 $5.00 5.30 $1,000 530 100 100 5.50 550 An end of the month (1/31/2007) inventory showed that 120 units were on hand. 11 How many units did the company sell during January 2007? a. 80 b. 120 C. 200 d. 280 12. If the company uses FIFO, what is the value of the ending inventory? a. $520 b. $600 c. $656 d. $1,424 If the company uses LIFO, what is the value of the ending inventory? a. $520 b. $600 c. $656 d. $1,480 13. 14. If the company uses FIFO and sells the units for $10 each, what is the gross profit for the month? a. $1,376 b. $1,424 $2,800 d. $3,000 C