A potential deal to take Tesla Inc. private would be by far the largest buyout in history. Tesla Chief Executive Elon Musk roiled markets on Tuesday, tweeting he was “considering” taking the Silicon Valley car maker private at $420 a share. At that share price, a buyout would cost about $72 billion, excluding debt.Tesla’s TSLA, +10.99% market value on Tuesday stood at $62 billion; the company has about $10 billion in debt. The stock ended 11% higher at $379.57 on Tuesday, its best since its Sept. 18 record close of $385. Tesla on Tuesday posted on its website an email from Musk to employees where he expanded on the idea of taking the company public. A final decision has not yet been made, but the goal would be “creating the environment for Tesla to operate best,” he wrote.via