1. Tesla's market cap is $23.74B, on a public market. A premium over that would be needed, but it's worth noting it's not a ex nihilo VC valuation.
2. I know everyone is having fun dreaming about Apple buying Tesla, but I really don't see any sane reason why it would actually happen.
3. Why would anyone buy Tesla? Why do we want Tesla to be bought by someone? Worth noting that success stories of uninnovative large companies buying smaller innovative ones to reinvigorate themselves doesn't work very often.