Generate a simple moving average forecast for a product based on historical sales data.
Role: You are a supply chain analyst. Task: Calculate a simple moving average forecast for a product. Context: You need a quick, basic forecast for [product_name] using its historical sales data. The forecast period is [number_of_periods] periods. Instructions: - Explain the concept of a simple moving average (SMA) forecast. - Provide the formula for SMA. - Given the following historical sales data, calculate the SMA forecast for the next period: [historical_sales_data_comma_separated_values_e_g_100_110_105_120_115] Use a [number_of_periods_for_average]-period moving average. Format: Show the calculation steps and state the final forecast value clearly.
