Suppose a four$-$period weighted average is being used to forecast demand. Weights for the periods are as follows: wt$-4=0\mathrm{.}1,$ wt$-3=0\mathrm{.}2,$ wt$-2=0\mathrm{.}3$ and wt$-1=0\mathrm{.}4.$ Demand observed in the previous four periods was as follows: At$-4=380,$ At$-3=410,$ At$-2=390,$ and At$-1=400.$ What will be the demand forecast for period t$?$

Multiple Choice

$399$

$403$

$397$

$402$

$393$