The density of gasoline is 730 kg/m3 at 0C. One gallon of gasoline occupies 0.0038 m3. Gasoline's volume expansion coefficient is 0.00096C-1. How many extra kilograms of gasoline are obtained when fifteen gallons of gasoline are bought at 0C rather than at 18C (tempera- ture at the filling station)? Answer in units of kg.