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Problem $04\mathrm{.}022-$ A friend has saved for seven years

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A friend tells you she has saved for seven years and has a present sum of $$26000,$ which she earned at the rate of $11\mathrm{.}00\%$ per year, compounded semi$-$annually.

Problem $04\mathrm{.}022.$a $-$ Determine the equivalent amount

Determine the equivalent amount she had to start with seven years ago.$($Round the final answer to three decimal places.$)$

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The equivalent amount she had to start with seven years ago is $ $.$