To find out how much you owe after purchasing the gasoline, you first need to calculate the total cost of the gasoline.
Total cost of gasoline = Price per gallon × Number of gallons
Total cost = $2.39 × 15.75
Now calculate that:
Total cost = $2.39 × 15.75 = $37.57 (approximately)
Now, subtract the amount you paid ($30.00) from the total cost:
Amount owed = Total cost - Amount paid
Amount owed = $37.57 - $30.00 = $7.57
Since this amount does not match any of the provided options exactly, but from the computation, there is a slight rounding difference. So the closest option would be:
$7.64 (though this is slightly off from the calculation, it seems to be rounding up)
Therefore, the best response is $7.64.