Microeconomics 6th Edition by Robert Hall, Shirley Kuiper, Marc Lieberman

Exercise 10

You have a part-time work/study job at the library that pays $10 per hour,3 hours per day on Saturdays and Sundays. Some friends want you to join them on a weekend ski trip leaving Friday night and returning Monday morning. They estimate your share of the gas,motel,lift tickets,and other expenses to be around $30. What is your total cost (considering both explicit and implicit costs)for the trip?