QD=3;000-10P QS=-1,000+10P where is Q is the number of businesses that need services and P is the monthly fee, in dollars, a. At what average monthly fee would demand equal zero b.at what average monthly fee would supply equal zero c.plot the supply and demand curves d.what is the equilibrium price/output level? e.suppose demand increases and leads to a new demand curve: Qd=3,500-10P What is the effect on supply? What are the new equilibrium P and Q?