Express Mail offers overnight delivery to customers. It is attempting to come to some conclusion on whether to expand its facilities. Currently its fixed costs are $2 million per month, and its variable costs are $2 per package. It charges $12 per package and has a monthly volume of 2 million packages. If it expands, its fixed costs will rise by $1 million and its variable costs will fall to $1.50 per package. Should it expand?