Determine which delivery alternative would be most economical for 80 boxes of parts. Each box costs $150 and annual holding cost is 30 percent of cost. Assume 365 days per year. Freight costs are:

Alternative	Freight Cost (for all 80 boxes)
Overnight	$225
Two-day	195
Six-day	135

Alternative (Click to select) Overnight Six-day Two-day

b. For what range of unit cost for a box would each delivery alternative be least costly?

Overnight is cheapest if unit cost > $ .? Two-day delivery is cheapest if $ < unit cost < $ ? Six-day delivery is cheapest if unit cost < $ ?