Question 202231
Remember  loga^b = b*loga
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100(1.11)^(x/6) = 400
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1.11^(x/6) =4
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log{1.11^(x/6) ) = log(4)
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(x/6) * log(1.11) = log(4)
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x/6 = log(4) /log(1.11) =13.2838
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x=6*13.2838 = 79.7026
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check
100(1.11)^(79.7026/6) = 400
400 = 400,,,ok