The Dress Designer Uses 15,000 Zippers a Year in Its

The Dress Designer uses 15,000 zippers a year in its production process. Currently, it purchases 1,000 zippers at a time and replenishes its inventory when it is depleted. The carrying cost per
Zipper is $.39. The fixed order cost is $35. How should The Dress Designer change its order
Quantity?

A) Decrease of 359 units.
B) No change.
C) Increase of 359 units.
D) Increase of 641 units.
E) Increase of 1,641 units.