Dodge Distributors Inc. wants to forecast sales using the weighted moving average model. The sales data for the last four months are: May = 200, June = 180, July = 220, and August = 240. If the company uses three months’ sales values and weights of 0.1, 0.3, and 0.6, with the higher weight for most recent month, what is the forecast for September?
a. 200
b. 210
c. 213
d. 228