A firm reports the following transactions

	Purchased Unit	Cost ($)	Sold unit
January	200	110
April			180
July	300	100
November			190

Using LIFO valuation method and periodic inventory systems, the cost of goods sold (COGS) is --------------------. Using LIFO valluation method and perpetual inventory systems, the cost of goods sold (COGS) IS -------------------

a. 37,700; 37,700

b. 38,800; 38,800

c. 37,700; 38,000

d. 38,800; 37,700