The opportunity cost of purchasing the sun hat and towel includes the items Maria could have purchased instead with the money she spent.
Since the sun hat costs $8.00 and the beach towel costs $7.00, Maria spends a total of $15.00.
Given that she had $20.00, after buying the sun hat and towel, she would still have $5.00 left.
The opportunity cost therefore includes any other items she could have purchased with that $15.00 instead of the sun hat and towel.
The relevant opportunity costs would be:
- the magazines ($8.00)
- the bathing suit ($15.00)
Ultimately, since Maria cannot buy the bathing suit or the magazines if she chooses the sun hat and towel, the opportunity costs are:
- the magazines
- the bathing suit
So the correct responses are:
- the magazines
- the bathing suit