$\mathrm{.}4\mathrm{.}21$ Refer to the trend$-$adjusted exponential smoothing illustration in Example $7.$ Using $=\mathrm{.}2$ and $=\mathrm{.}4,$ we forecast sales for $9$ months, showing the detailed calculations for months $2$ and $3.$ In Solved Problem $4\mathrm{.}2,$ we continued the process for month $4.$

In this problem, show your calculations for months $\frac{?}{\text{b}\text{a}\text{r}}()$ and $6$ for $F_t,T_t,$ and $FI{T}_t.[$PX$]$