A bond has a Macaulay duration equal to

$10\mathrm{.}510\mathrm{.}5$

and a yield to maturity of

$8\mathrm{.}58\mathrm{.}5\%.$

What is the modified duration of this$$ bond?

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Part $1$

The modified duration of this bond is

enter your response here.

$($Round to two decimal$$ places.$)$