Graham Company uses a periodic inventory system. Details for the inventory account for the month of January, 2010 are as follows:

Units

Per unit price

Total

Balance, 1/1/10	200	$5.00	$1,000
Purchase, 1/15/10	100	5.30	530
Purchase, 1/28/10	100	5.50	550

An end of the month (1/31/10) inventory showed that 120 units were on hand. How many units did the company sell during January, 2010?

	A.	200
	B.	120
	C.	280
	D.	80