Suppose the demand for towels is given by QD = 100 − 5P , and the supply of towels is given by QS = 10P . a) Derive and graph the inverse supply and inverse demand curves. 1 b) Solve for the equilibrium price and quantity. c) Suppose that supply changes so that at each price, 20 fewer towels are offered for sale. Derive and graph the new inverse supply curve. d) Solve for the new equilibrium price and quantity.