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OpenStudy (anonymous):
From 1970 to 1990, the consumer price index (CPI) increased from 38.8 to 130.7. If a jar of grape jelly cost $0.25 in 1970 and the price of grape jelly increased at the same rate as the CPI from 1970 to 1990, approximately how much did a jar of grape jelly cost in 1990? A. $0.59 B. $0.84 C. $1.31 D. $0.39
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