Employ weights of 0.4,0.3,and 0.3 to obtain a weighted moving average for April,May and June.Calculate the error terms. 
Definitions:
Ending Inventory
The sum value of merchandise on offer for sale upon the conclusion of an accounting term.
Retail Value
The price point at which goods are sold to consumers, typically set higher than the wholesale price to cover costs and generate profit.
Average Cost Retail Inventory Method
An inventory valuation method that determines the cost of ending inventory and cost of goods sold based on the average cost of all similar items in the inventory.
Cost-to-retail Percentage
A method used in inventory valuation that compares the cost of goods to their retail price to calculate inventory value.
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