Basil is a broke college student who consumes only coffee and pizza. Coffee is $2 per cup, and pizza is $5 per pizza. Basil's weekly budget constraint is shown. On the graph, show how his budget constraint would change if Basil gets an additional $10 per week from his grandmother.

Which of the following tends to result in a decrease in the selling price of houses in an area? a. an increase in the population of the city or town. b. an increase in the labor costs of construction. c. an increase in the income of new residents in the city or town. d. an increase in mortgage interest rates.