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The average rate of change will be the slope of the straight line connecting the two points (1990,$5.15) and (2009,$7.25).  Given any two points on a line, (x1,y1) and (x2,y2), the formula for the slope of the line, m, is:
m = (y2-y1)/(x2-x1)
Can you compute the slope (average rate of change) for your problem?