Question $18(5$ points$)$

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Refer to the information in Question $17.$

What is the forecast for the $4^{th}$ year's sales revenue by using double smoothing method with $=0\mathrm{.}4$ and $=0\mathrm{.}2($start with initial estimates $S_1=226$ and $T_1=10$ for the $1^{st}$ year$)?$

$265\mathrm{.}1243$

$255\mathrm{.}1242$

$267\mathrm{.}3023$

$254\mathrm{.}6131$