A company's total cost, in millions of dollars, is given by C(t) = 260-60et where t = time in years. Find the marginal cost when t = 6. Round to the nearest hundredth. OA. 0.64 million dollars per year B. 0.89 million dollars per year OC. 0.15 million dollars per year O D. 0.33 million dollars per year

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