Example 4 (Calculator Active): For 0 ≤s ≤ 5000, the total amount a local college spends on printing (2000) is related to the number of students enrolled at the school and is modeled by C(s) = 70-32 cos where s is the number of students enrolled at the college and C is the total cost of printing, in thousands of dollars. At what rate is the total cost of printing changing, in dollars per student, when 2500 students are enrolled at the college?

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