Researchers have found that the risk of coronary heart disease rises as blood cholesterol increases. This risk may be approximated by the function

where R is the risk in terms of coronary heart disease incidence per 1000 per year, and c is the cholesterol in mg/dL. Suppose a person’s cholesterol is 180 mg/dL and going up at a rate of 15 mg/dL per year. At what rate is the person’s risk of coronary heart disease going up?

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R(c) = 3.19(1.006), 100 ≤ c ≤ 300,