a$.$ Evaluate a seasonally adjusted trend forecasting model.

Note: Round all of your answers to $\backslash (\backslash$mathbf$\{3\}\backslash )$ decimal places except "Absolute Percent Error" which should be rounded to $2$ decimals.

$\backslash$begin$\{$tabular$\}\{|$c$|$c$|$c$|$c$|$c$|$c$|$c$|$c$|$c$|$c$|\}$

$\backslash$hline Period & Month$-$Year & Month & $\backslash$begin$\{$tabular$\}\{$l$\}$

Sales $\backslash \backslash$

$(\backslash$$ Million$)$

$\backslash$end$\{$tabular$\}$ & Trend & Index & Forecast & Absolute Error & Absolute Percent Error & $\backslash \backslash$

$\backslash$hline $1$ & Jan$-2020$ & $1$ & $58,722$ & $0\mathrm{.}000$ & $0\mathrm{.}000$ & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $2$ & Feb$-2020$ & $2$ & $55,870$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $3$ & Mar$-2020$ & $3$ & $73,901$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $4$ & Apr$-2020$ & $4$ & $64,383$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $5$ & May$-2020$ & $5$ & $68,436$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $6$ & Jun$-2020$ & $6$ & $63,973$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $7$ & Jul$-2020$ & $7$ & $66,892$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $8$ & Aug$-2020$ & $8$ & $64,500$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $9$ & Sep$-2020$ & $9$ & $62,100$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $10$ & Oct$-2020$ & $10$ & $64,017$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $11$ & Nov$-2020$ & $11$ & $63,920$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $12$ & Dec$-2020$ & $12$ & $67,027$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $13$ & Jan$-2021$ & $1$ & $64,785$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $14$ & Feb$-2021$ & $2$ & $59,018$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $15$ & Mar$-2021$ & $3$ & $64,734$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $16$ & Apr$-2021$ & $4$ & $63,749$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $17$ & May$-2021$ & $5$ & $68,015$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $18$ & Jun$-2021$ & $6$ & $66,531$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $19$ & Jul$-2021$ & $7$ & $68,923$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $20$ & Aug$-2021$ & $8$ & $68,259$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $21$ & Sep$-2021$ & $9$ & $66,939$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $22$ & Oct$-2021$ & $10$ & $69,523$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $23$ & Nov$-2021$ & $11$ & $68,948$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline $24$ & Dec$-2021$ & $12$ & $73,617$ & & & & & & $\backslash \%\backslash \backslash$

$\backslash$hline

$\backslash$end$\{$tabular$\}.$ What are the MAD and MAPE?

Note: Round your answers to $2$ decimal places.

What are the monthly indexes?

Note: Round your answers to $4$ decimal places. d$.$ Forecast sales for January, February, March, and April of $2022.$ Note: Round your answers to $3$ decimal places.