Petra opens her mail one day to find that an anonymous donor has given her $3000 cash. (Woohoo!) She sets aside $1000 to refurnish her apartment, and decides to invest the other $2000. Unfortunately, the value of the stock swhe invested in started going down almost as soon as she invested her money. If the stock decreases at a rate of 15% per year for eight years, how much is the stock worth when she sells it eight years later?