The Annual Demand of the Year 2010 Is Provided Below

Multiple Choice

The annual demand of the year 2010 is provided below.Find the forecasted demand for January, 2011.
Use a 3-month weighted moving average method.The weight ratio is 3:2:1 with the heaviest weight applied to the most current data.
$$\begin{array} { c l l l l l l l l l l l l } \text { Month } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 \\\hline \text { Actual Demands } & 120 & 130 & 70 & 10 & 5 & 15 & 25 & 7 & 50 & 70 & 80 & 160\end{array}$$

A) 93.04
B) 5.9
C) 20.22
D) 23.14