Answer:
The price of gasoline each time of $180.50 is excessive so this might be a typo. I will answer with that figure and then with the figure I think is right.
Using gasoline price of $180.50;
Change in bank account = 50 - (180.50 * 3)
= -$491.50
Using gasoline price of $18.50.
Change in bank account = 50 - (18.50 * 3)
= -$5.50