The demand equations for related products A and B are given by q A ? = 26 p A ? p B ? ? ? and q E ? demanded, and p A ? and p B ? are the corresponding prices (in dollars) per unit. (a) Find the values of the two marginal demands for product A when p A ? = 16 and p B ? = $ (b) If p B ? is reduced to 7 from 9 , with p A ? fixed at 16 , use part (a) to estimate the corresp (Simplify your answer.) A. ? p A ? ? q A ? ? = B. ? q A ? ? p A ? ? = ven by q A ? = 26 p A ? p B ? ? ? and q B ? = 3 3 p B ? p A ? ? ? , where q A ? and q B ? are the quantities of A and B in dollars) per unit. uct A when p A ? = 16 and p B ? = 9 art (a) to estimate the corresponding change in demand for product A