Using the data set below, what would be the forecast for period $5$ using the exponential smoothing method? Assume the forecast for period $4$ is $14000.$ Use a smoothing constant of $=0\mathrm{.}4($Choose the closest answer.

Formula: $F_{t+1}=F_t+(A_1-F_t)$

$\backslash$table$[[$Period$,$Actual Demand$],[1,10000],[2,12400],[3,13250],[4,14750],[5,15220],[6,18500]]$