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To make some extra money, Nasim decided to make dog sweaters and sell them. Nasim bought a pair of knitting needles for $9 and estimates that the materials (yarn, button, miniature coat hanger) to make one sweater cost $2.10. Customers are charged $15 per sweater. Which of the profit models below must Nasim use to calculate the profit p for making n sweaters?
A. p=6n-2.1
B. p=12.9n-9
C. p=15n-11.1
D. p=3.9n
E. p=12.9n