[originaltext] The United States central bank has raised an important intere

The United States central bank has raised an important interest rate by one-fourth of 1 percent. The federal funds rate, a rate paid by banks for short-term loans, is now one-half of 1 percent.
    Janet Yellen, the first woman to lead the Federal Reserve System, spoke after the announcement. The decision was based on a few factors, Yellen said. Economic growth is expected to continue in the U.S. Another reason to increase interest rates, Yellen noted, was the low official rate of inflation. The central bank has said its target inflation rate is 2 percent. It says that rate would help support employment and keep prices stable. However, inflation currently is not at the target rate, but below 1 percent. The federal reserve chief also said the strong labor market provided another reason to raise rates. The U.S. economy is adding about 200,000 jobs each month.
1 What is the news report mainly about?
2 What do we learn about the target inflation rate set by the central bank?