erage using .60 for august .30 for july and .10 june .60(20) + .30(22) + .10(18) = 20.4 s most reasnoble. t the Weighted Average mehod would be the best choice for ptember sales. As seen on the plot in problem a, sales are in a high the last two months staying fairly high compared to previous al transaction that have been completed and are or have already received payment. Demand is