Elly Company uses a periodic inventory system. Details for the inventory account for the month of January, 2018 are as follow Per unit price Units Total Balance, 1/1/18 200 $5.00 $1,000 Purchase, 1/15/18 100 5.30 530 Purchase, 1/28/18 100 5.50 550 An end of the month (1/31/18) inventory showed that 150 units were on hand. How many units did the company sell during Ja 2018? O 200 O 250 O 150 O 50