The gas tank in Catherine’s car is \frac18 full. When 30 litres of gas are added, the tank becomes \frac34 full. If the gas costs Catherine \$1.38 per litre, how much will it cost her to fill the remaining quarter of the tank?
Answer Choices
A. \$8.80
B. \$13.80
C. \$16.56
D. \$24.84
E. \$41.40