Assume a demand equation for good 'x': Q = 9 - 0.1p - Py + 0.01p2 + 0.0005Y; where p = own price of the good Py = price of a related good = $3 Q = quantity demanded Pz = 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 =[ If the price of this good 'x' is equal to $42 per unit, what would be the quantity demanded? | units. (enter your response rounded to one decimal place)