$\"\"$

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Ammount $\"\"$ , where $\"\"$ is principle, $\"\"$ is rate and $\"\"$ is time.

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(a).

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When $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute the values in $\"\"$ .

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$\"\"$

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The amount $\"\"$ is $\"\"$ .

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$\"\"$

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(b).

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When $\"\"$ , $\"\"$ and $\"\"$ .

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Substitute the values in $\"\"$ .

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$\"\"$

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The amount $\"\"$ is $\"\"$ .

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$\"\"$

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(a).

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The amount is $\"\"$ .

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(b).

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The amount is $\"\"$ .