Refer to Exhibit 4-9. Suppose that the government imposes a price ceiling at a price of $15. The number of units that would be exchanged in this market would be Group of answer choices 150, since that is the equilibrium quantity and the price ceiling is above the equilibrium price. 80, since that is the number of units demanded at the price ceiling. 260, since that is the number of units supplied at the price ceiling. 170, since that is the average of the quantity demanded and the quantity supplied at the price ceiling.

You are the manager of a large crude-oil refinery. as part of the refining process, a certain heat exchanger (operated at high temperatures and with abrasive material flowing through it) must be replaced every year. the replacement and downtime cost in the first year is $165 comma 000. this cost is expected to increase due to inflation at a rate of 7% per year for six years (i.e. until the eoy 7), at which time this particular heat exchanger will no longer be needed. if the company's cost of capital is 15% per year, how much could you afford to spend for a higher quality heat exchanger so that these annual replacement and downtime costs could be eliminated?