Using the information to answer questions from $15$ to $17.$

Lululemon store manager that sells yoga pants, wants to prepare a forecast for the number of pants demanded during January, February, and March of $2022.$ His forecasts for yoga pants are a combination of trend and seasonality.

He uses the equation Yt $=80+8$t$,$ where t$=0$ is June of $2021.$ Seasonal relatives are $1\mathrm{.}05$ for January, $1\mathrm{.}07$ for February, and $0\mathrm{.}85$ for March. What will be $"$t$"$ in January $2022?$