2010 Pascal Problem 18

The gas tank in Catherine's car is \frac{1}{8} full. When 30 litres of gas are added, the tank becomes \frac{3}{4} full. If the gas costs Catherine \$1.38 per litre, how much will it cost her to fill the remaining quarter of the tank?

\textbf{(A)}\ \$8.80\quad \textbf{(B)}\ \$13.80\quad \textbf{(C)}\ \$16.56\quad \textbf{(D)}\ \$24.84\quad \textbf{(E)}\ \$41.40

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Pascal contests here.