3. The hotel has an untapped outdoor lounge at the present time, and the hotel has received two offers to exploit the hall: First: renting it to a contractor worth 25,000 dinars annually. Second: Using it as an external restaurant for Chinese food. In this case, the total revenue during the year is expected to be 45,000 dinars, and the total expenditures 18,000 dinars. If one of the two alternatives is chosen, how much is the opportunity cost and how much is the differential cost in this case? (3 Points)