Answer:
Nissan mileage = 28 miles/gallon
1 mile = 1.609344 kilometer and 1 gallon = 3.78541 liter.
Nissan mileage = 28 × 1.609344/3.78541 kilometer/liter
Nissan mileage = 11.90 kilometer/liter
Cayman Porsche uses an average of 10 liters for every 100 km.
Cayman Porsche mileage = 100/10 kilometer/liter = 10 kilometer/liter
The Nissan Sentra Coupe will give more mileage at 11.90 kilometers per liter so it will be economic.
Step-by-step explanation: