Answer:
1. The opportunity cost was the sleep needed for the Big swim meet up over the money she would have gotten from the extra shift
Step-by-step explanation:
2. The opportunity cost is the 12 cent interest forgone over the loan to matt
3. The opportunity cost is the risk of $65 for the casual gown(stable income) over the $500 high fashion gown
4. The opportunity cost is the building of the new airship desicion forgone over the buy out of the competitors