Question

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Answer 1

Let P(y) represent the final cost of the DVD,

Answer 2

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

Answer 3

12% off means that you pay only 88% of the original cost.

Answer 4

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

Answer 5

The expression means that you need to pay an additional 3% on top of your original cost.

Answer 6

Let's combine the expressions together.

Answer 7

okay

Answer 8

\[P(y) = (y \times (1-0.12)) \times (1+0.03) = y \times 0.88 \times 1.03\]

Answer 9

First of all, you cannot subtract 0.03y. You are paying tax, not getting a discount.

Answer 10

*messed

Answer 11

You can subtract the 0.12y as that is your discount.

Answer 12

Yes, your signs are mixed up.