$\"\"$

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Initial investment is $\"\"$ .

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Find rate.

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The general form of invesetment rate is $\"\"$ .

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Apply logarithm on both sides.

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$\"\"$

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$\"\"$ .

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Therefore, the annual rate is $\"\"$ .

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$\"\"$

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Find the Amount after $\"\"$ years.

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General form is $\"\"$ .

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Substitute $\"\"$ , $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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Amount after $\"\"$ years is $\"\"$ .

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$\"\"$

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Annual rate is $\"\"$ is $\"\"$ .

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Amount after $\"\"$ years is $\"\"$ .