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Michelle buys a motorcycle for $10,000. The motorcycle loses 20% of its value each year. The depreciation of the motorcycle is shown by the graph. After how many years is the value of the motorcycle worth less than $3000?
 Mar 1, 2012

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[input]plot( 10000 * ( 1-20/100 )^x, 3000 , x=0..6 )[/input]
 Mar 1, 2012

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