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Karyn uses a certain credit card that sends her a monthly [#permalink]
05 Nov 2005, 10:12
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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?