65/25
800 miles / 16 miles per gallon = 50 gallons x $4 per gallon = $200.
1,200 miles at 12 miles per gallon = 100 gallons.100 gallons at $3.50 per gallon = $350 .
72.64
256
$121.76
$750.
334/15 assuming miles/gallon (miles per gallon) is constant
(1,000 miles) x (1 gallon/20 miles) x ($4/gallon) = $4,000/20 = $200
$211.20
50.54
$533.33
$129.