cardi decides to spend two hours working her part-time job rather than going to see her friends. she earns $45 per hour for overtime work. her opportunity cost of working is group of answer choices the $90 she earns working. the $90 minus the enjoyment she would have received from seeing her friends. the enjoyment she would have received had she saw her friends. nothing, since she would have received less than $90 worth of enjoyment from seeing her friends.