The Super Discount store sells packs of paper towels, at the rate of approximately 60 packs per day. The annual cost to hold them in inventory is estimated at $0.50 per pack. The cost to place an order for more is $20. Assuming 300 working days in a year, what is the optimal time between orders (in days)? Round your final answer to the nearest integer.

	A.	4
	B.	20
	C.	17
	D.	1