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wlad13 [49]
2 years ago
12

A CD usually sells for $15.00. If the CD is 10% off, and sales tax is 5%, what is the total price of the CD, including tax?

Mathematics
1 answer:
dybincka [34]2 years ago
5 0

Answer:

<em>The total price of the CD is $14.18</em>

Step-by-step explanation:

<u>Percentages </u>

We can compute additive or subtractive percentages by using these formulas. If we have a number X and want to increase it by Y%, then the increase is xY/100. Thus the new value for the number is x+xY/100 or equivalently

X(1+Y/100)

If we want to decrease by Z%, the new value is

X(1-Z/100)

The regular price for a CD is X=$15. The CD is Z=10% off, so the sale price is

15(1-10/100)=\$13.5

But we have to add the tax of Y=5%, so the final value is

13.5(1+5/100)=\$14.18

The total price of the CD is $14.18

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