Answer
See explanation
Work Step by Step
To calculate the cost of driving $500$ miles using gasoline, we can use the formula: $$\text{cost} = \frac{\text{distance}}{\text{mileage}} * \text{fuel cost}$$ So $$\text{cost} = \frac{500\text{ miles}}{28.0\text{ miles/gal}} * \$3.50\text{ /gal} = \$62.50$$
To calculate the cost of driving $500$ miles using E85, we can use the same formula: $$\text{cost} = \frac{500 \text{ miles}}{22.5 \text{ miles/gal}} * \$2.85\text{ /gal} \approx \$63.30$$ Therefore, it will cost $\$62.50$ to drive $500$ miles using gasoline, and it will cost $\$63.30$ to drive $500$ miles using E85. E85 fuel is more expensive than gasoline fuel in this scenario.
