Here, the monetary cost is $15 (the transportation).
And the opportunity cost is what you gave up by going to the game: $8 x 5 hours = $40.
So the total cost is $55.
Because if you had worked instead of going to the game, you would have saved $15 and ALSO made $40. And in this sense, "a penny saved is a penny earned."
Get it?
(If you want to be a smart aleck, you can also point out to your teacher that the question omits the information about how much it costs for transportation to get to your JOB, and only gives information about how much it costs to get to the game. So maybe the total cost should be a little less than $55, because you have to deduct the transportation cost to get to your job!)
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