Please show complete work, no excel!

Use the information in the table to the right. Use the 3 - month weighted moving - average method to calculate the forecast for month 9 . The weights are 0.60 , 0.30 , and 0.10 , where 0.60 refers to the most recent demand. A. $3,396 B. $3,229 C. $3,916 D. $3,880 A sales manager wants to forecast monthly sales of the machines the company makes using the following monthly sales data