The linear model P = 3.75 g + 1.5 P=3.75g+1.5 predicts the total cost, P P, in dollars, to purchase g g gallons of gas at a gas station. Based on the linear model, how much should it cost to purchase 12 12 gallons of gas?

$ 17.25
$ 21.75
$ 45.00
$ 46.50