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Karyn uses a certain credit card that sends her a monthly

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Senior Manager
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Karyn uses a certain credit card that sends her a monthly  [#permalink]

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New post 05 Nov 2005, 11:12
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A
B
C
D
E

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Karyn uses a certain credit card that sends her a monthly
rebate of 2% of all of her purchases. In a certain year,
Karyn received an average (arithmetic mean) rebate of $9 a
month. What was the total amount of Karyn's purchases on the
credit card that year?

A. $5,400
B. $6,250
C. $4,800
D. $3,375
E. $5,924
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New post 05 Nov 2005, 11:29
rebate of 9$ annually means a total rebate of 9*12 for the year = 108$

108 is 2% of x --> 108 / 2/100 = 10800 / 2 = 5400 = Answer A
Senior Manager
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Joined: 02 Oct 2005
Posts: 297
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New post 05 Nov 2005, 20:15
OA is A and here is the detailed explanation for other's benefit:

We first need to determine how much of a rebate Laura spent
during the year.

Mean = (sum of all values) / (number of values)

$9 = (sum of all values) / 12
$108 = (sum of all values)

Thus, she received a total rebate of $108 for the year. This
means that $108 was 2% of her purchases for the year. We can
now set up the following equation:

(Purchases) * .02 = $108
Purchases = $108/.02
Purchases = $5,400
  [#permalink] 05 Nov 2005, 20:15
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Karyn uses a certain credit card that sends her a monthly

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