5. Consumer and Producer Surplus; Price Ceilings and Price Floors

The supply and demand curves for a product are as follows. What is producer surplus if a price floor of \$21 is set? 

Q_D = 45 - 2P
Q_S = -15 + P

The supply and demand curves for a product are as follows. What is deadweight loss if a price ceiling of \$2 is set? 

Q_D = 600 - 100P
Q_S = -150 + 150P