Revenue Functions The total weekly revenue (in dollars) of Country Workshop associated with manufacturing and selling their rolltop desks is given by the function R(x, y) = -0.2x 0. "V = 0.4 ( 1 - V )-D.6 8 ( _ V) (which is greater than 0) Interpret your result. For constant v, an increase in V ---Select-- o the engine efficiency. (b) Show that DE/av