Vicky's coffee shop expects total sales of decorative coffee mugs to be $ 108,000 . The price per unit is $ 9 . The firm estimates an ordering cost of $ 6.00 per order , with an inventory carrying cost of $ 1.50 per unit . What is the economic order quantity ? ( round to the nearest whole number )

Select one :

a 310 units

b 380 units

c 1138 units

d 930 units