blended coffee

Question

Deluxe coffee is to be mixed with regular coffee to make at least 50 pounds of a blended coffee. The mixture must contain at least 14 pounds of deluxe coffee. Deluxe coffee costs $7 per pound and regular coffee $6 per pound. How many pounds of each kind of coffee should be used to minimize costs?

Answer 1

If 14 pounds must be the more expensive coffee, then, to minimize, the other 36 pounds should be the cheaper.