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After 5 years the area is 3/4 of what it was; after 10 years 3/4 of 3/4, or 9/16; after 20 years 9/16 x 9/16 = 81/256 = 0.3164; so 1-.3164 = 0.6836 or 68.36% disappears

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10y ago

What else can I help you with?