Answer:
Total Cost in Dollars: $46.07
Step-by-step explanation:
Step 1: Calculate total number of gallons needed:
If car get 31 miles/gallon, it will need 420/31 gallons in total, which is 13.55 gallons.
Step 2: Since 1 gallon costs $3.40, the cost of trip will be total number of gallons multiplied by cost of 1 gallon.
Answer: 13.55 × 3.40 = $46.07
