Given the Excel file of data below, determine the forecast for Year $20$ based on the linear trend method. Round your result to $1$ decimal place, if applicable. Year Cost$/$Unit $($$$)$

$120\mathrm{.}0$

$224\mathrm{.}5$

$328\mathrm{.}2$

$427\mathrm{.}5$

$526\mathrm{.}6$

$630\mathrm{.}0$

$731\mathrm{.}0$

$836\mathrm{.}0$

$935\mathrm{.}4$