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20-05-2015
Mathematics

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20000=15000(1.072)^t

Respuesta :

20-05-2015

   20,000 = 15,000 (1.072)^t

Divide each side by 15,000 :    4/3 = (1.072)^t

Take the log of each side:    log(4/3) = t log(1.072)

Divide each side by log(1.072):    t = log(4/3) / log(1.072)

      0.12494 / 0.03019 = 4.138 (rounded)

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