Suppose every Buick owner's demand for gasoline is 20 - 5 p for p less than or equal to 4 and 0 for p > 4. Every Dodge owner's demand is 15 - 3 p for p less than or equal to 5 and 0 for p > 5. Suppose that Gas Pump, South Dakota, has 100 Buick owners and 150 Dodge owners.

If the price of gasoline is $3.50, what is the total amount of gasoline demanded in Gas Pump?

a.1,850 gallons

b. 1,387.50 gallons

c. 462.50 gallons

d. 925 gallons

e. None of the above.