4. If a company’s sales and forecast for 2018 were 320 and 350 units of products respectively, and the smoothing constant was 0.4, what will be the forecast for 2019?

To calculate the forecast for 2019 using exponential smoothing, we need to use the formula:

Forecast for 2019 = (Smoothing Constant * Actual Sales for 2018) + ((1 - Smoothing Constant) * Forecast for 2018)

Given that the actual sales for 2018 were 320 units and the forecast for 2018 was 350 units, and the smoothing constant is 0.4, we can substitute these values into the formula:

Forecast for 2019 = (0.4 * 320) + ((1 - 0.4) * 350)
= (0.4 * 320) + (0.6 * 350)
= 128 + 210
= 338

Therefore, the forecast for 2019 is 338 units of products.