Elon Musk just hit a key milestone on his path to a $55 billion payday — here's how his elaborate Tesla compensation plan works

· The average value of Tesla's stock over the last six months hit $100 billion after Monday's market close.
· That means CEO Elon Musk could soon receive the first tier of a potentially massive payday.
· According to the company's 2018 compensation agreement with Musk, hitting this milestone will unlock stock options that...