12. The Shiners are planning to drive to the Upper Peninsula from Detroit. They arranged to rent a car for
$55.75 a day with no charge for mileage.
a. What will it cost the Shiners to rent the car for 10 days if they spend $178 for gasoline and
$12.50 in bridge fees?

b. What will it cost per mile if the Shiners drive about 1090 miles?