Cliff Lawrence owns CL Skating, an ice-skating rink that accommodates 200 people. Cliff charges $10 per hour to skate. The cost of attendants to staff CL Skating is $100 per day. Utilities and other fixed costs average $2,000 per month. Recently, the manager of an out-of-town hockey team approached Cliff concerning renting the rink for a full day of practice on an upcoming Sunday for the lump sum of $1,000. Attendants would not be needed. CL’s normal operating hours on Sunday are 10 AM to 7 PM, and the average attendance is 10 skaters per hour. What is the opportunity cost of accepting the offer?