Find the equilibrium price and quantity for each of the following pairs of demand and supply functions. a. QD=14−6P QS=1+7P b. QD=1720−50 PQS=1400+30P c. QD=220−0.4P QS=130+0.1P d. QD=4000−0.4P QS=2000+0.6P e. QD=12,000−200P QS=200P a. The equilibrium price is $__ per unit and the equilibrium quantity is __ unit(s).