The opportunity cost of working is the enjoyment that she would have received if she had gone to the park.
The opportunity cost of a particular activity in microeconomic theory is the value or benefit given up by engaging in that activity in comparison to engaging in an alternative activity. Simply put, if you choose one activity (for example, an investment), you forfeit the opportunity to do something else. The optimal activity is the one that, net of opportunity costs, provides the highest return when compared to all other activities.
For example, if you buy a car and use it solely for personal transportation, you cannot rent it out, whereas if you rent it out, you cannot use it for personal transportation. Opportunity cost can be defined in basic equation form as "Opportunity Cost = (returns on best Forgone Option) - (returns on Chosen Option)."
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