Xinhua News Agency/Getty, Tony Cordoza/Getty, Issarawat Tattong/Getty, Tyler Le/BIIt's all but guaranteed that the Federal Reserve will cut interest rates this week.It comes after years of aggressive inflation fighting from the central bank.While it will take time to feel the impact of the cuts, lower rates will have benefits.The time has finally come: Americans are about to find out how big of an interest-rate cut they'll be getting this week.On Wednesday, the Federal Open Market Committee will announce its next move on interest rates, and it's all but certain the nation's central bank will cut for the first time in four years.