An investor buys$/$a $4\mathrm{.}4\%$ annual payment bond withi Ti years to to maturity. The bond is priced at a yield$-$to$-$maturity of $3\mathrm{.}4\%\%.$ What ist is the bond's Macaulay duration?i$?$

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$6\mathrm{.}2.$ marginofleeron $+1-1\%$

Recall that Macaulay duration in the weighted average time to receive the presentivalue of eacticash flow: