Simple moving average for product 8

Using the simple moving average to forecasting the weekly sale in 3/25/2015 for product 8. I finished all the excel work about this product 8. in the history data, some of them have promotion, some not. I separate them, please using the data with promotion, I am named worksheet 8a1,8b1,8c1,8d1,8e1. answer the follow question like a paragraph.
the advantage of using SMA for weekly forecasting.
Whats the nature of product? (1 or 2 sentences)
How to run the test with the data?(main part)
Whats the forecasting accuracy?
BTW, since this is a term work, for my part is called 4.3.2.1 in the structure.

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