Assume a demand equation for good 'x': Q = 9 - 0.1p - py + 0.01pz + 0.0005Y; where p = own price of the good py = price of a related good = $3 Q = quantity demanded p2 = price of a different related good = $200 Y = consumer income = $4,000/mo. The quantity demanded as a function of the price can be written: Q=D Suppose Firm A has a supply curve of QA = '2 + p and Firm B has a supply curve of QB = 0.5p How much is the total supply at a price of $3? Total supply is D thousand units (enter your response as a real number rounded to one decimal place)