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anonymous

  • one year ago

From 1940 to 1980 the consumer price index (CPI) increased from 28.6 to 89.4. If a gallon of milk cost $0.75 in 1940 and the price of milk increased at the same rate as the CPI from 1940 to 1980, approximately how much did a gallon of milk cost in 1980? I need help getting this started. can someone help me? :)

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  1. Mertsj
    • one year ago
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    Write a proportion.

  2. Mertsj
    • one year ago
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    \[\frac{28.6}{89.4}=\frac{.75}{x}\]

  3. anonymous
    • one year ago
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    I may be wrong, but it looks like it's asking for the rate in change over the past forty years. Then multiply that by the cost of milk to arive at the adjusted price in 1980

  4. Mertsj
    • one year ago
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    Cross multiply and solve.

  5. anonymous
    • one year ago
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    Thank you, :)

  6. anonymous
    • one year ago
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    well, I don't think this is a division problem, more of a subtration

  7. anonymous
    • one year ago
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    1980-1940 = 40 years 89.4 - 28.6 = 60.80

  8. anonymous
    • one year ago
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    now you could do your division 60.80/40= 1.52 and multiply that by the cost of milk in 1940 0.75 * 1.52 =$1.14

  9. anonymous
    • one year ago
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    Thank you! I was doing that but somewhere I got the wrong answer! Thank you! :)

  10. anonymous
    • one year ago
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    and if that is not the answer then I might think to add the 1.52 to the 0.75 =$2.27

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