SunlandCompany uses a periodic inventory system. Details for the inventory account for the month of January, 2018 are as follows:

	Units	Per unit price	Total
Balance, 1/1/18	170	$4.00	$680
Purchase, 1/15/18	160	5.10	816
Purchase, 1/28/18	160	5.70	912

An end of the month (1/31/18) inventory showed that 260 units were on hand. How many units did the company sell during January, 2018?

a. 320

b. 230

c. 100

d. 260