Joe runs a business and needs to decide how many hours to stay open. Figure 2.2 illustrates his marginal benefit of staying open for each additional hour. Suppose that we observe Joe staying open 3 hours per day. If he is following the marginal principle, what must his marginal cost per hour be?

In the figure above, the richest 20 percent of households receive ________ of total income

A) 55 percent B) 45 percent C) 80 percent D) 60 percent

Refer to Figure 13-6. Suppose Dell finds the relationship between the average total cost of producing notebook computers and the quantity of notebook computers produced is as shown by Figure 13-2

Dell will maximize profits if it produces ________ notebook computers per month. A) 100,000 B) 200,000 C) 300,000 D) Not enough information is given to determine the profit-maximizing quantity.