Chemistry, unit convertion

Question

While in Europe, if you drive 109 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car's gas mileage is 28.0 mi/gal ? Assume that 1euro=1.26dollars

Answer 1

109 km/day x 7 day/wk x 1 mi/1.61 km x 1 gal/28 mi = 16.9 gal/wk

16.9 gal/wk x 1 liter/0.264 gal = 64 liters/wk

64 liters/wk x 1.10 euro/liter x $1.26/euro = $88.70/wk