Using proportions, it is found that the total cost of gasoline and rental for the trip is of $253.
<h3>What is a proportion?</h3>
A proportion is a fraction of a total amount.
In this problem, the total cost is composed by:
- The gasoline cost, of $3.85 per gallon, considering that 1200/30 = 40 gallons were used.
Hence, the total cost is given by:
C = $3.85 x 40 + $99 = $253.
More can be learned about proportions at brainly.com/question/24372153
