The whole question is: past sale show that when a tablet pc is priced at $450, the quantity demanded is 8000 units per week. when the price drops to $400, the quantity demanded rises to 12000 units per week. The manufacturer will not market any of the devices if the price is $300 or lower, but at a price of $325, the manufacturer is willing to market 2100 items.

Find the equilibrium quantity and the equilibrium price.