Bonita Company uses a periodic inventory system. Details for the inventory account for the month of January, 2020 are as follows:

	Units	Per unit price	Total
Balance, 1/1/20	170	$5.00	$850
Purchase, 1/15/20	70	5.20	364
Purchase, 1/28/20	70	5.40	378

An end of the month (1/31/20) inventory showed that 180 units were on hand. How many units did the company sell during January, 2020?

a. 110

b. 130

c. 140

d. 180