In one day, Sue can change the oil on 20 cars or change the tires on 20 cars. In one day, Fred can change the oil on 20 cars or change the tires on 10 cars. Sue's opportunity cost of changing oil is
Than Fred's and her opportunity cost for changing tires is than Fred's.

Question

Quizplus · Accepted Answer

Sue's opportunity cost for changing oil is the number of cars she could have changed tires on instead. 
Sue's opportunity cost for changing tires is the number of cars she could have changed oil on instead. 
Comparing Sue and Fred's opportunity costs: 
For changing oil, Sue's opportunity cost is 20 cars and Fred's is 10 cars. Therefore, Fred's opportunity cost for changing oil is lower than Sue's, so Sue's is greater. 
For changing tires, Sue's opportunity cost is 20 cars and Fred's is 20 cars. Therefore, their opportunity costs are the same so Sue's is not less than Fred's. Thus, Sue's opportunity cost for changing tires is also greater than Fred's. Therefore, the best option is D.

In One Day, Sue Can Change the Oil on 20