SOLUTION: there are currently 58 million cars in a certain country. decreasing exponentially by 3.6% annually. how many years will it take for this country to have 30 million cars?

Question 685555: there are currently 58 million cars in a certain country. decreasing exponentially by 3.6% annually. how many years will it take for this country to have 30 million cars?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
there are currently 58 million cars in a certain country. decreasing exponentially by 3.6% annually. how many years will it take for this country to have 30 million cars?
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Each year the # is 96.4% of the previous year.
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30 mil = 58 mil*0.964^x
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0.964^x = 0.5172
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x*log(0.964) = log(0.5172)
x = 18 years (when rounded up)
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Cheers,
stan H.
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