以下是引用px100在2008-1-23 17:21:00的发言:I heard that there also has one question, about if a stock price goes down 20%, what is the increase percentage to goes back? 1. Define the price of this stock was A before it goes down. 2. After the price goes down 20%, the latest price is: A*(1-20%). 3. To goes back to price A, the increase percentage should be: A-[A*(1-20%)]/A*(1-20%) = 25%
So, 'Danger in stock market, caution on boarding'  |