The U.S.? government, like many governments throughout the? world, bailed out large financial institutions that were thought to be?"too big to? fail" during the 2008 financial crisis. Suppose a bank has the opportunity to invest in a risky project. If the project is? successful, the bank will earn ?$80; if it is?unsuccessful, the bank will lose ?$100. The probability that the project will be successful is 0.50

The expected value of investing in this project is ?$

?(Enter your response rounded to one decimal place and use a minus sign if necessary?.)