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Price of microchip - percentage [#permalink]
28 Jul 2009, 13:16

1

This post was BOOKMARKED

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B

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Difficulty:

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Question Stats:

0% (00:00) correct
0% (00:00) wrong based on 1 sessions

The price of a microchip declines by 67 percent every 6 months. At this rate, approximately how many years will it take for the price of an $81 microchip to drop below $1?

As price of the chip declines by 67%, the new price of the chip after 6 months is 33% of the original price. So price of chip after 6 months = 81/3 Price of chip after n number of 6 months = 81/(3^n) given 1 = 81/(3^n) 81 = 3^n n = 4 So number of years = 4*6/12 = 2 Answer is B

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