Tara's taking a road trip for the weekend.  She drives for two days, stopping to fill up her gas tank each time from empty to full when she needs it.  She visits 4 different gas stations in total, with the price of gas being $3, $3.50, $4, and $4.50 respectively at each.  If Tara's car has a 12-gallon tank, how much does she spend on gas for her road trip?
Please reason step by step, and put your final answer within \boxed{}.
user