OPTIMAL COST According to AAA (AutomobileAssociation of America), on March 27, 2009

Chapter 6, Problem 42

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OPTIMAL COST According to AAA (AutomobileAssociation of America), on March 27, 2009, thenational average price per gallon of regular unleaded(87-octane) gasoline was $2.03, and the price ofpremium unleaded (93-octane) gasoline was $2.23.(a) Write an objective function that models the cost of theblend of mid-grade unleaded gasoline (89-octane).(b) Determine the constraints for the objective functionin part (a).(c) Sketch a graph of the region determined by theconstraints from part (b).(d) Determine the blend of regular and premiumunleaded gasoline that results in an optimal cost ofmid-grade unleaded gasoline.(e) What is the optimal cost?(f ) Is the cost lower than the national average of $2.15per gallon for mid-grade unleaded gasoline?

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