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Answer :
Final answer:
The price of a tube of toothpaste increased by approximately $1.87 from 1970 to 1990.
Explanation:
To find the increase in the price of a tube of toothpaste from 1970 to 1990, we need to calculate the percentage increase using the consumer price index (CPI) values. The percentage increase can be calculated using the formula:
Percentage Increase = [(New Value - Original Value) / Original Value] * 100
Using this formula, the approximate increase in the price of a tube of toothpaste from 1970 to 1990 is 243.3%. So, if the price of toothpaste was $0.77 in 1970, it would have increased by approximately $1.87 to $2.64 in 1990.
Learn more about Inflation and Consumer Price Index (CPI) here:
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