Kingbird, Inc. uses a periodic inventory system. Details for the inventory account for the month of January 2017 are as follows: Balance, 1/1/2017 Purchase, 1/15/2017 Purchase, 1/28/2017 Units 340 170 170 Per unit price $6.0 6 Total $2040 1020 1071 6 An end of the month (1/31/2017) inventory showed that 270 units were on hand. How many units did the company sell during January 2017? O 410 O 270 O 100 0 340