Stutz Department Store will buy 10 pairs of sunglasses if the price is $76 per pair and 30 pairs if the price is $26. The supplier of the sunglasses is willing to provide 35 pairs if the price is $81 per pair but only 5 pairs if the price is $21. Assuming that the supply and demand functions for the sunglasses are linear. Required:
a. Find the two ordered pairs for the demand function in the form (q, p).
b. Find the market equilibrium point.