Mathematics

1 October, 22:05

From 1970 to 1990, the consumer price index (CPI) increased from 38.8 to 130.7. If a tube of toothpaste cost $0.77 in 1970 and the price of toothpaste increased at the same rate as the CPI from 1970 to 1990, by approximately how much did the price of a tube of toothpaste increase from 1970 to 1990?

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