How much would it cost to drive 225 miles if your car gets 9mpg?

The average cost of gasoline in the United States is $4 per gallon. To calculate the cost of driving 225 miles, we can use the following formula:

```

Cost = (Distance / MPG) * Cost per gallon

```

Plugging in the values we know, we get:

```

Cost = (225 miles / 9 MPG) * $4 per gallon

```

```

Cost = 25 gallons * $4 per gallon

```

```

Cost = $100

```

Therefore, it would cost $100 to drive 225 miles in a car that gets 9 MPG.