please show work

Problem 1 The following data are monthly sales of jeans at a local department store. The buyer would like to forecast the sales of jeans for the next month of August Month January February March April May June July 37 35 42 38 48 45 41 Sales a. Using the nave method, forecast sales for the month of August b. Using a four-period moving average, forecast the sales for the month of August. c. forecast the sales for the month of August using a three-period weighted moving average with the most recent month weighted 60%, the next most recent weighted 30%, and the third most recent weighted 10%., d. Using exponential smoothing with a = 0.2, forecast the sales for the month of August. Use the nave method to start the smoothing process in February