3. Alex is a brand manager of a fast fashion chain in Sydney. He would like to forecast sales of its store in Sydney in the coming week (week 6) based on the sales of the last 5 weeks. Sales of the last 5 weeks are in table below. Forecast next week sales using Exponential Smoothing method (Alpha=0.5). (15 marks) Week Sales (S) 4000 2 4200 3 3900 4 3860 6 4500