Big Games for Big Kids Sell a Variety of Gaming

Big Games for Big Kids sell a variety of gaming consoles and games.The company has presented you with the following information for the sales of a new product,Angel's Hat 2,for the three months from November to January.They began in November with 50 units on hand valued at $1500.In the lead up to Christmas each unit sold for $90 but in the post-Christmas sales in January this price was reduced to $50.
$\begin{array}{|l|l|r|}\hline&&\$\\\hline\\\hline\\\hline \text { Opening imventory-1 November } 2011 & 50 \text { units } & 1500 \\\hline\\\hline\\\hline \text { Sales on } 9 \text { November 2011 } & 45 \text { units } @ \$ 90 & 4050 \\\hline \text { Purchases on 10 November 2011 } & 70 \text { units } @\$ 40 & 2800 \\\hline \text { Sales on 12 November 2011 } &60 \text { units } @ \$ 90 & 5400 \\\hline \text { Purchases on 24 November 2011 } & 50 \text { units @ } \$ 40 & 2000 \\\hline \text { Sales on 1 December 2011 } & 50 \text { units } @\$ 90 & 4500 \\\hline \text { Purchases on 1 December 2011 } & 80 \text { units } @ \$47 & 3760 \\\hline \text { Sales on 24 December 2011 } & 60 \text { units } @ \$ 90 & 5400 \\\hline \text { Purchases on 29 December 2011 } & 100 \text { units } @ \$ 50 & 5000 \\\hline \text { Sales on January 2012 } & 90 \text { units @ } \$ 50 & 4500 \\\hline \text { Purchases on 10 January 2012 } & 10 \text { units } @\$ 42 & 420 \\\hline \text { Sales on 15 January 2012 } & 20 \text { units } @ \$50 & 1000\\\hline\end{array}$
Big Games for Big Kids use the periodic system to record inventory.A physical stock take reveals 30 units on hand at the end of January.What is the cost of sales and value of ending inventory using the FIFO cost-flow assumption?

A) cost of sales: $14 190; ending inventory: $1290
B) cost of sales: $14 060; ending inventory: $1420
C) cost of sales: $14 060; ending inventory: $1260
D) cost of sales: $24 850; ending inventory: $1420