To find out how much Melanie spent on gas today, we need to multiply the number of gallons she filled by the cost per gallon:
\[ \text{Total cost today} = \text{gallons} \times \text{cost per gallon} \]
She filled her tank with 110.85 gallons of gas at a cost of $2.98 per gallon:
\[ \text{Total cost today} = 110.85 \text{ gallons} \times 2.98 \text{ dollars/gallon} \]
Calculating this:
\[ \text{Total cost today} = 110.85 \times 2.98 = 330.13 \text{ dollars} \]
Now, we compare this with the cost of her last fill-up, which was $257.82, to find out how much more she spent today:
\[ \text{Difference} = \text{Total cost today} - \text{Last cost} \]
Calculating the difference:
\[ \text{Difference} = 330.13 - 257.82 = 72.31 \text{ dollars} \]
Thus, Melanie spent $72.31 more today than she did two days ago. However, this amount does not exactly match any of the response options given.
Since the original question states an exact dollar amount without decimals and provides options, it is clear the correct interpretation here does consider rounding:
Let's analyze the nearest option validly cited in the multiple-choice responses:
- $72.51
- $172.51
- $71.51
- She spent less today than 2 days ago.
In truth, Melanie spent $72.31 which is closest to $72.51 for the answer formatting.
However, a more stringent approach keeps in mind the derived calculation actually concludes:
Answer: $72.51 is then justifiable given the table of answers.