According to Automobile Association of a Country,on March 27,2009,the National

Multiple Choice

According to automobile association of a country,on March 27,2009,the national average price per gallon of regular unleaded (87-octane) gasoline was $2.07,and the price of premium unleaded (90-octane) gasoline was $2.25.Write an objective function that models the cost of the blend of mid-grade unleaded gasoline (89-octane) . ​

A) C = 2.25x - 2.07y
B) C = 87x + 89y
C) C = 2.07x + 2.25y
D) C = 87x + 90y
E) C = 90x + 89y