Pham & Davis currently sells motor homes per year at $ each, and luxury motor coaches per year at $ each. The company wants to introduce a new portable camper to fill out its product line. It hopes to sell of these campers per year at $ each. An independent consultant has determined that if the new campers are introduced, sales of its existing motor homes will most likely increase by units per year while the sales of its motor coaches will probably decline by units per year. What is the amount that should be used as the annual sales figure when evaluating the portable camper project?