Jack’s Tracks sells 24,000 custom-designed GoKarts per year. These GoKarts are sold evenly throughout the year. The manufacturer charges Jack a $50 processing cost per order, and Jack incurs a carrying cost of $240 per year including storing each GoKart at a local warehouse. What is the economic order quantity for ordering materials?
a. 100 

b. 1,000
c. 2,000 

d. 10,000