Suppose the economy only produces three goods: bread, laptops, and movies. Calculate the CPI of 2008, using 2004 as the base year.

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CPI = (current year price × base year quantity) / (base year price × Base year quantity)

CPI for bread in current year = [($1.50 × 2,000) / ($1 × 2,000)] x 100 = 150

CPI for laptops in current year = [($1,500 × 100) / ($2,000 × 100)] x 100 = 75

CPI for movies in current year = [($7 × 50) / ($5 × 50)] x 100 = 140

CPI for current year = (CPI for bread x weight of bread) + (CPI of laptops x weight of laptops) + (CPI of movies x weight of movies) = (150 x $2,250/$227,530) + (75 x$225,000/$227,530) + (140 x $280/$227,530) = 1.48 + 74.17 + 0.17 =75.82

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