a. Add a salvage value that the retailer earns for each unit that remains unsold at the end season to the linear program in the Excel file "Retailer analysis". The salvage value should be an input parameter that can be changed by another user, and the retailer's objective should be to maximize total revenue including any revenues from salvage sales. b. Set the salvage value equal to 25. What is the optimal markdown strategy if the weekly demand at full price is 100? What is the optimal markdown strategy if the weekly demand at full price is 20