Science popularization post: Sell a 150000 yuan call option on BTC that expires at the end of March, with a current premium of 1.95% (annualized 15%) based on the currency standard; Expired price<; 152000 is profitable; If holding a spot to sell bullish, if the expiration price exceeds 150000, that is, selling BTC at the price of 150000 will yield a 30% spot profit 🤑