The sales tax in one state is 5%. Write a function rule for finding the total cost of an item with selling price x. Then find the total cost

Question

The sales tax in one state is 5%. Write a function rule for finding the total cost of an item with selling price x. Then find the total cost of a CD player with a selling price of $110.

f(x) = 5 + x; $111.05

f(x) = 1.05x; $115.50

f(x) = x – 5; $108.95

f(x) = 0.05x; $5.50

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Eirian 4 days 2021-07-19T17:01:41+00:00 1 Answers 1 views 0

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    2021-07-19T17:03:03+00:00

    Answer:

    The sales tax in one state is 5%. Write a function rule for finding the total cost of an item with selling price x. Then find the total cost of a CD player with a selling price of $110.

    A. f(x) = 5 + x; $111.05

    B. f(x) = 0.05x; $5.50

    C. f(x) = x � 5; $108.95

    D. f(x) =1.05x; $115.50  

    total cost = (price) + (5% of price)

    f(x) = x + 0.05x

    f(x) = 1.05x

    So the function is f(x) = 1.05x

    Plug in x = 110 to get

    f(x) = 1.05x

    f(110) = 1.05*110

    f(110) = 115.50

    The item costs $115.50 (after tax is added on)

    Step-by-step explanation:

    1:    the total cost of a CD player would be 104.76

    2:    Total Cost = (price) + (5% of price)

    f(x) = x + 0.05x

    f(x) = 1.05x

    So the function is f(x) = 1.05x

    Plug in x = 110 into the function

    f(110) = 1.05*110

    f(110) = 115.50

    The item costs $115.50

    3:    Answer:

    f(x) = .05x; $5.50

    Step-by-step explanation:

    f(x) = .05x

    f(110) = .05(110) = $5.50

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