Donegal footwear is an international supplier of outdoor footwear for adventurous families. currently, the company uses a logistical provider to provide warehouse services and handle packages destined for ground delivery. the contract calls for $ 10 million in annual fixed charges, which covers the provider's overhead and warehouse costs, and variable costs of $13.00 per package shipped. recently, donegal footwear found a warehouse it could lease at a cost of $20 million per year, which includes lease costs, labor, and management oversight. furthermore, the company found another provider who would deliver packages from the warehouse for $5.00 per package. considering only costs, how many packages must donegal footware ship to make the vertical integration into warehouse operations beneficial? donegal footwear must ship ▼ more than less than nothing packages to make the vertical integration into warehouse operations beneficial. (enter your response as an integer.)