Answer:Economic rent-$320,000
Opportunity Cost-80,000
Step-by-step explanation:
Economic rent is the extra amount or addition earned by a production resource here and in this context,Mr Kurt is the resource.In this scenario,the extra amount he earned as a professional golfer having quit engineering for it and thus had a step-up(addition) of $320,000.
While the opportunity cost which known as the alternative forgone in order in favour of another alternative in a decision process here is $80,000.In this case,he had to forego engineering job($80,000) and therefore concentrate on professional golfing which paid him more(400,000) not omitting the fact that he could have engaged in the two jobs at same time.