In Problem 1, Suppose Every Buick Owner's Demand for Gasoline

In Problem 1, suppose every Buick owner's demand for gasoline is 20 - 5p for p less than or equal to 4 and 0 for p > 4. Every Dodge owner's demand is 15 - 3p for p less than or equal to 5 and 0 for p > 5. Suppose that Gas Pump, South Dakota, has 100 Buick owners and 250 Dodge owners. If the price of gasoline is $4, what is the total amount of gasoline demanded in Gas Pump?

A) 1,500 gallons
B) 375 gallons
C) 1,125 gallons
D) 750 gallons
E) None of the above.