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In surveying a beach, a geologist estimates that, starting from the present, the tons of sand on the beach will wash away at a rate of 5 percent every 5 years. The beach presently has 40,000 tons of sand.If the geologist is correct, how much time will elapse before the sand is completely washed from the beach?

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In surveying a beach, a geologist estimates that, starting from the present, the tons of sand on the beach will wash away at a rate of 5 percent every 5 years. The beach presently has 40,000 tons of sand.<br>If the geologist is correct, how much time will elapse before the sand is completely washed from the beach?






 
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