(Table: Variable Costs for Lawns) Look at the table Variable Costs for Lawns. During
the summer, Alex runs a lawn-mowing service, and lawn-mowing is a perfectly
competitive industry. Assume that costs are constant in each interval; that is, the
variable cost of mowing 1 through 10 lawns is $100. His only fixed cost is $1,000 for
the mower. His variable costs include fuel, his time, and mower parts. If the price for
mowing a lawn is $40, how many lawns will Alex mow?
A) 0
B) 20
C) 30
D) 40
Which of the following describes two goods that are most likely substitutes in
consumption?
A) loaves of bread and sticks of butter
B) loaves of bread and toasters
C) loaves of bread and hamburger buns
D) loaves of bread and gasoline