Rock Bottom Carpets Sells 3,100 Carpets a Year at an Average

Rock Bottom Carpets sells 3,100 carpets a year at an average price per carpet of $1,640.The carrying cost per unit is $218.40.The company orders 500 carpets at a time and has a fixed order cost of $78 per order.The carpets are sold out before they are restocked.What is the economic order quantity?

A) 38 carpets
B) 66 carpets
C) 47 carpets
D) 51 carpets
E) 72 carpets