A hotel has 150 rooms. A room with additional services costs $80 per night, and one without additional services costs $60 per night. On a night when the hotel is completely occupied, the total revenue is $10,000. How many of each type of room does the hotel have?

Thank you i only have eight problems the next one is The perimeter of a rectangular field is 300 meters. This field is to be fenced along three sides only. The fencing along its two lengths and one width is to be done at $50 per meter. If the total cost of fencing is $12,000, what are the fieldâ€™s dimensions?