GameStop (GME) has offered $56 billion in cash and stock to buy (EBAY). But an interview with CEO Ryan Cohen on the math surrounding the deal raised more questions than answers. GameStop is roughly a fourth the size of eBay, with roughly $9 billion of cash on its balance sheet. The company said it has a “highly-confident letter” from TD Bank for $20 billion in debt financing. Meanwhile, eBay’s valuation is $46 billion. Cohen appeared annoyed by CNBC hosts when pressed on how the company would come up wit ...