Please check my answer thanks :)

What is the dollar value of ending inventory if there was 300 units on hand Dec 31 Round your answer to the nearest dollar Use the FIFO method
Inventory of windshelid wipers

Jan 1 300 units @$11.00=3300
Mar 1 150 units @ $10.5=1575
Jun 1 200 units @$ 10.75=2150
Sept 1 175 units @ $10.00=1750
Dec 1 100 units @ $1200+ 1200
-------
9975


I totally messed this up

I am still not getting this question what do those numbuers mean (23784724 ect) thanks :)