Suppose That the Percent of Total Personal Income That Is

Multiple Choice

Suppose that the percent of total personal income that is used to pay personal taxes is given by , where x is the number of years past 1990 (Source: Bureau of Economic Analysis, U.S. Department of Commerce) . Find the year or years when the percent of total personal income used to pay personal taxes is 18 percent. ​

A) 2013
B) 2003
C) ​2002
D) ​2008
E) ​2044