optimazation , please solve by using hand writing with clear font

a Q6: At a certain refinery, the refining process requires the production of at least 2 gallons of gasoline for each gallon of fuel. To meet these demands at winter, at least 3*106 gallons of fuel oil a day will need to be produced. The demand for gasoline, on other hand, is not more than 6.4*106 gal/day. The gasoline selling price is $ 1.9/gal and for fuel oil is $ 1.5/gal. Formulate this problem to maximize revenue