A student uses approximately 40 to 45 gallons of gasoline per month. The cost of gasoline varies between $2.96 and $3.61 per gallon. Which of the following is a reasonable estimate of the student's weekly gasoline expense?
A. $15
B.$30
c. $45
D. $50
Take the median cost of both to estimate.
(42.5/30 * $3.29) * 7 = ?
To determine the reasonable estimate of the student's weekly gasoline expense, we need to calculate the average cost per gallon of gasoline and then multiply it by the number of gallons used in a week.
To find the average cost per gallon, we add the lowest and highest prices of gasoline and divide the sum by 2. Hence, the average cost per gallon is (2.96 + 3.61) / 2 = 3.28.
Now, we multiply the average cost per gallon (3.28) by the number of gallons used in a week (40 - 45 gallons). Assuming the student uses 40 gallons, the weekly gasoline expense is 3.28 * 40 = $131.20.
Among the given options, $15, $30, $45, and $50, the closest reasonable estimate to $131.20 is option D. $50.
Therefore, option D. $50 is a reasonable estimate of the student's weekly gasoline expense.