Karen works part-time at a local convenience store and earns $10 per hour. She wants to spend next Saturday afternoon attending a music concert. The full price of a concert ticket is $75, but Karen was able to get a discounted price of $50 from a friend who purchased the ticket but has become unable to attend. If Karen took 4 hours off from her job to attend the concert, what was her opportunity cost of attending the concert

Opportunity cost refers to the loss of value or benefit that would result from engaging in a certain activity option in comparison to engaging in an alternative activity that offers a higher return on value or benefit. It gives the value of the best alternative chosen in the process of decision-making.

According to the given question, Karen gets paid $10 per hour for her part-time job. She wanted to attend the concert and price of the concert ticket after getting the discount is $50.

The four hours off from the job will cost = $10 × 4 hours

= $40

The opportunity cost for attending the concert = $50+$40

= $90

Therefore, it can be concluded that opportunity cost will be $90. Hence, option (D) is correct.

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Your question is incomplete, but most probably the full question was...

What was her opportunity cost of attending the concert?

a.$40

b.$50

c.$75

d.$90