Problem 3-12 (Algo) Assume that your stock of sales merchandise is maintained based on the forecast demand. If the distributor's sales personnel call on the first day of each month, compute your forecast sales by each of the three methods requested here. NOTUM 230 170 190 July August a. Using a simple three month moving average, what is the forecast for September? (Round your answer to 2 decimal places.) Forecast for Becember b. Using a welghted moving average, what is the forecast for September with welghts of 30,0,40, and 0.30 for June, July, and Aigus, respectively? (Do not round Intermediate calculation Round your answer to decimal places.) Focus for the Using a simple three-month moving average, what is the forecast for September? (Round your answer to 2 decimal places.) Forecast for September b. Using a weighted moving average, what is the forecast for September with weights of 0.30, 0.40, and 0.30 for June, July, and August, respectively? (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Forecast for September c. Using single exponential smoothing and assuming that the forecast for June had been 132, forecast sales for September with a smoothing constant a of 0.20. (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Forecast for Beptember