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Each of the CD players sold by Store S last month was sold a

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Each of the CD players sold by Store S last month was sold a [#permalink] New post 05 Mar 2017, 09:24
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Each of the CD players sold by Store S last month was sold at the price of $119.95 plus a 7 percent sales tax. Approximately what was the total revenue, including sales tax, for the CD players sold by Store S last month?

A) $8,640

B) $9,240

C) $10,270

D) $10,800

E) $11,550
[Reveal] Spoiler: OA

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Re: Each of the CD players sold by Store S last month was sold a [#permalink] New post 11 Mar 2017, 20:37
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Explanation

Find the number of CD players sold by Store S:

Table: 90 in stock
Graph: 80% sold
80% of 90 = 0.80 \times 90 = 72

Find the total cost of one CD player with sales tax:

Sales tax: 7% or 0.07
$119.95 \times 1.07 = $128.3465 (Since we are approximating, round to $128.35)

If you forget how to compute sales tax, you can find the tax and add it to the item:

7% of $119.95 = 0.0.07 \times 119.95= 8.3965 (round to 8.4)

$119.95 + 8.4 = $128.35

Now find the cost of 72 CD players:

72 CD players \times $128.35 = $9241.20 The closest answer is $9,240.

Hence option B is correct.
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