9. After plotting the following demand data, a manager has concluded that a trendadjusted exponential smoothing model is appropriate to predict future demand. Use periods 1 to 4 to estimate the initial smoothed trend (use the increase from day 1 to day 4 divided by 3) and the actual value for period 4 to estimate the initial smoothed series. Use \(\alpha=0.5\) and \(\beta=0.4\) to develop forecasts for periods 5 through 10.LO4Page 106\begin{tabular}{|l|l|}\hline Period, \( t \) & \(\mathrm{A}_{t}\) Actual \\\hline 1 & 210\\\hline 2 & 224\\\hline 3 & 229\\\hline 4 & 240\\\hline 5 & 255\\\hline 6 & 265\\\hline 7 & 272\\\hline 8 & 285\\\hline 9 & 294\\\hline 10 & \\\hline\end{tabular}