exponential functions

chassity

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Joined
Nov 14, 2010
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The area of a wetland drops by a sixth every four years. What percent of its total area disappears after twenty years?

Round your answer to two decimal places.


I cant figure this one out.. i keep getting 99.987 which would be 99.99% and when i enter that it says its wrong. any help would be greatly appreciated.
 
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