A bookstore costs $75 a day to keep open, and spends $10 for each book it
sells. The store charges $15 for each book it sells. If n represents the number
of books sold, which equation represents the cost function for this
bookstore?
O A. C = 15n+75
O B. C = 10n + 75
O C. C = 75n + 10
O D. C = 750 + 15
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