The consumer price index (CPI) is a measure of the average change of prices paid by urban consumers for goods and services. If a worker earned $18.50 per hour in the year 1990, how much would he need to earn in 2004 to have the same buying power as he did in 1990? A) $12.80 B) $26.03 C) $26.74 D) $27.41 E) $32.83