MiCo Opens for business in 20x3 and uses the periodic method and LIFO costing,. On Dec. 31, 20x3, there are 900 units of merchandise in Mico's inventory @ $11. Mico's 20x4 merchandise purchases are as followes

Feb 4 1200 @ $14.00

March 10 2,000 @ $15.00

July 7 3,300 @ $18.00

Oct. 21 4,200 @ $20.00

If Mico's December 31, 20x4 physical county shows 1500 units in ending inventory, then endin inventory on Mico's balance sheet would be

a. 21,300

b. 30,000

c. 18,3000

d. 21,900

I know B and C are incorrect. Need to see how to break down to get the correct answer