The amount of foreign earnings (in trillions of dollars) kept overseas can be approximated by the function f(x)=0.223(1.21), where x=5 corresponds to the year 2005. Find the first full year in which the foreign earnings kept overseas exceeds the following amounts (a) $1.6 trillion (b) $2.2 trillion (a) The first full year in which the foreign earnings kept overseas exceeds $1.6 trillion is 2011 (Type a whole number.) (b) The first full year in which the foreign earnings kept overseas exceeds $2.2 trillion is (Type a whole number)