What was the per capita bottled water consumption in the U.S. 10 years ago?

  • Thread starter bjoyful
  • Start date
In summary, the estimated bottled water consumption in the U.S. in 2002 was 6.09 billion gallons based on a reported 21 gallons per person and a population of 290 million. If the per capita consumption has increased 20% in the last 10 years, the per capita consumption in 1992 was approximately 17.5 gallons.
  • #1
bjoyful
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0

Homework Statement



Bottled water consumption was reported to be 21 gal per person in the United States in 2002. The last census reported 2.9 x 10^8 people in the U.S.
A. What is the total estimated bottled water consumption in the U.S.?
B. If the per capita consumption of bottled water has increased 20% in the last 10 years, what was the per capita consumption 10 years ago?

The Attempt at a Solution



A. 290,000,000 (or 2.9x10^8) x 21 gal = 6,090,000,000 (or 6.09x10^9)
B. 20% of 21 gallons is 4.2 gallons. Do I add or subtract that from the 21 gal? How do I figure what the per capita consumption was 10 years ago?
 
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  • #2
Be careful. Saying that the consumption has increased 20% from 1992 means that it has increased by 20% of the consumption in 1992- and we don't know what that was! If we let C= consumption in 1992, then "increasing 20%" means it increased by 0.20C. The consumption in 2002 would be the consumption in 1992 plus the increase: C+ .20C= 1.20C. Since you are told that the consumption in 2002 was 21 gallons per person, 1.20C= 21. Solve that for C to find the per capita consumption in 1992.
 
  • #3
Wow, I am amazed at the number of posts you have done:) I think that is the most I have seen! Ok, on to my problem...Thanks for explaining this problem in depth. I had wondered if the 10 years ago was from the 2002 or not, so thanks for pointing which one is was out. To figure out what the per capita consumption in 1992 was, I divided 21 by 1.20C. I got 17.5. Did I use the correct formula? Does this answer make sense? thanks
 
  • #4
bjoyful said:
Wow, I am amazed at the number of posts you have done:) I think that is the most I have seen! Ok, on to my problem...Thanks for explaining this problem in depth. I had wondered if the 10 years ago was from the 2002 or not, so thanks for pointing which one is was out. To figure out what the per capita consumption in 1992 was, I divided 21 by 1.20C. I got 17.5. Did I use the correct formula? Does this answer make sense? thanks

I hope you mean that you divided 21 by 1.2 and got C= 17.5 gallons of bottled water consumed per capita in 1992.
 
  • #5
Sorry that I did not write my 17.5 in a complete sentance! Yes, I did mean 17.5 gallons of bottled water consumed per capita in 1992.
 

What is a percent?

A percent is a way of expressing a number as a fraction of 100. It is often represented by the symbol %.

How do I calculate a percent of a number?

To calculate a percent of a number, you can use the formula: (percent/100) x number. For example, to find 25% of 80, you would do (25/100) x 80 = 20.

What is the difference between a percent increase and a percent decrease?

A percent increase means the number has grown in value, while a percent decrease means the number has decreased in value. For example, a 20% increase in a number means the number has grown by 20%, while a 20% decrease means the number has decreased by 20%.

How do I find the original amount after a percent increase or decrease?

To find the original amount after a percent increase or decrease, you can use the formula: original amount / (1 +/- percent/100). For example, if a number increased by 25% and the resulting number is 125, you can find the original amount by doing 125 / (1 + 25/100) = 100.

Can I add or subtract percents?

No, percents cannot be added or subtracted. Instead, you can convert the percents to decimals and then add or subtract the decimals. For example, 25% + 50% can be converted to 0.25 + 0.50 = 0.75, which is equivalent to 75%.

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