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Mathematics 11 Online
OpenStudy (anonymous):

From 1980 to 2000, the consumer price index (CPI) increased from 82.4 to 172.2. If a pound of margarine cost $0.51 in 1980 and the price of margarine increased at the same rate as the CPI from 1980 to 2000, approximately how much did a pound of margarine cost in 2000?

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