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anonymous

  • one year ago

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  1. anonymous
    • one year ago
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    Let P(y) represent the final cost of the DVD,

  2. anonymous
    • one year ago
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    If you have a discount of 12% off, that is \[y \times (1-0.12)\]. Correct?

  3. anonymous
    • one year ago
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    12% off means that you pay only 88% of the original cost.

  4. anonymous
    • one year ago
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    Now, let's write the tax added cost. 3% tax means: \[y \times (1 + 0.03)\]

  5. anonymous
    • one year ago
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    The expression means that you need to pay an additional 3% on top of your original cost.

  6. anonymous
    • one year ago
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    Let's combine the expressions together.

  7. anonymous
    • one year ago
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    okay

  8. anonymous
    • one year ago
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    \[P(y) = (y \times (1-0.12)) \times (1+0.03) = y \times 0.88 \times 1.03\]

  9. anonymous
    • one year ago
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    First of all, you cannot subtract 0.03y. You are paying tax, not getting a discount.

  10. anonymous
    • one year ago
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    *messed

  11. anonymous
    • one year ago
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    You can subtract the 0.12y as that is your discount.

  12. anonymous
    • one year ago
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    Yes, your signs are mixed up.

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spraguer (Moderator)
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