Here are three DIFFERENT things you could do if you don’t go…

Here are three DIFFERENT things you could do if you don’t go with friends to the beach this weekend: go rock climbing at the gym (you value this activity at $70), work on the term paper for your history class (you value this activity at $30), or work two extra shifts at your job (you could earn $50 this weekend). The opportunity cost of going to the beach with your friends this weekend is: