ExplanationFind the number of CD players sold by Store S:

Table: 90 in stock

Graph: 80% sold

80% of 90

= 0.80 \times 90 = 72Find 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 = $128.35Now 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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Sandy

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