Sam, a college student, has a number of options for his 10-week summer. He needs to choose from the following options with regard to work and...

8. Sam, a college student, has a number of options for his 10-week summer. He needs to choose from the following options with regard to work and school. He can either: (1) Work full time (40 hours per week) at the local country club making $10 per hour. (2) Take a summer class which will cost $700 and last all summer. During this time he will work 15 hours per week making $10 per hour. (3) Take a class at a cost of $700 and not work at all during the summer. Sam’s opportunity cost of taking the class if he chooses option 3 over option 1 would be: