Scenario 18-3 sam has two jobs, one for the winter and one for the summer. in the winter, he works as a lift attendant at a ski resort where he earns $13 per hour. during the summer, he drives a tour bus around the ski resort, earning $11 per hour. refer to scenario 18-3. during the winter months, what is sam's opportunity cost of taking an hour off work to go skiing?
a. $13
b. less than $11
c. $11
d. between $11 and $12