Suppose you plan to attend a language program at university this summer. If you do, you will not be able to take your usual summer job that pays $6500 for the summer and you will not be able to stay at your parents' house "for free." The cost of your tuition will be $2100, textbooks $210, and living expenses $1600. What is the opportunity cost of attending the language program? Please provide your answer in monetary terms and show your reasoning.