Given,
Amount spend on gas is $35/week.
Amount spend on payment is $260/month.
Amount spend on insurance is $400/6 month.
Amount spend on oil is $25/ 3 month.
Required
The monthly car expenses.
The monthly car expenses are,
[tex]\begin{gathered} Monthly\text{ expense=30}\times\frac{35}{7}+260+\frac{400}{6}+\frac{25}{3} \\ =150+260+66.67+8.33 \\ =485 \end{gathered}[/tex]Hence, the expense of the car is $485.