$\"\"$

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The rate of interest $\"\"$ and time $\"\"$ .

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Total amount avaliable is $\"\"$ .

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Monthly compound interest is $\"\"$ .

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Find the principal amount.

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$\"\"$

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

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$\"\"$

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$\"\"$

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The principal amount is $\"\"$ .

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$\"\"$

\

The principal amount is $\"\"$ .