5. You are the manager of Telecall Inc., a small telemarketing company. Your company pays $10,000 per month for office space. A real estate agent has noticed that you are only using 75 percent of your available space and tells you that Telecall could add $800 per month to its bottom line by renting out the space it does not use. Telecall has been asked to do a new telemarketing campaign for a large credit card company, but this would require it to use the remaining office space. What is the opportunity cost of using the extra office space to handle the credit card company's promotion?