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Suppose you have a choice of working full-time during the summer or going full-time to summer school. Summer tuition and books are $2,200. If you worked, you could make $7,000. Your rent is $1,000 for the summer, regardless of your choice. The opportunity cost of going to summer school is, therefore,

A. $7,000

B. $10,200

C. $8,000

D. $9,200

E. $2,200