math help

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Mr. Richards has two cars that he changes the oil in every four months.

During an oil change, each car needs 4 1/2 quarts of oil.
Each 5-quart container of oil costs $14.99.
Before tax, how much will the oil cost Mr. Richards for both cars in a year?
A
$44.97

B
$80.94

C
$89.94

D
$107.93
why is this c

  • math help -

    every 4 months is 3 times a year

    for 2 cars, 6 oil changes

    6 * 4.5 = 27 qt of oil

    (27 / 5) * 14.99 = ?

    looks more like B

    but if the oil has to be purchased in 5 qt increments
    then 27/5 means 6 containers (answer C)
    but (again) there is oil left over that can be used next year
    so his AVERAGE yearly cost is B

    the question is certainly ambiguous

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