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6 March, 15:39

Freda bought a sandwich for $4.00 and a drink for94$. Her grandson ordered a meal for$6.35. What was the total price of all three items when 8% sales tax was added? Explain how touse estimation to check whether your answer is reasonable

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  1. 6 March, 17:22
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    Total price = $112.70

    Step-by-step explanation:

    Total price of all three items without tax = 4 + 94 + 6.35

    = $104.35

    Total price of all three items with tax = (100% + tax) * Price

    = (100% + 8%) * 104.35 = 108% * 104.35

    = 1.08 * 104.35 = 112.698

    ≅ $112.70

    (2) Explain how to use estimation to check whether your answer is reasonable:

    We can use estimation to check if a result is reasonable by plugging in the answer in the original equation.

    E. g. x + 4 = 10; x = 10 - 4

    We get that x = 6

    Plug in x = 6 in x + 4 = 10.

    6 + 4 = 10. Indeed the answer was a reasonable one.
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