$\backslash$table$[[$Period$,$Demand$],[1,500],[2,402],[3,389],[4,400],[5,438],[6,287],[7,450]]$

Using double exponential smoothing method to develop forecasts for dem $4?$ Assume $=0\mathrm{.}9,=0\mathrm{.}5,A_1=500,T_1=30.$

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The forecasted sales for period $2$ is $$

The forecasted sales for period $3$ is $$

The forecasted sales for period $4$ is $$

The forecasted sales for period $5$ is $$