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Bunuel
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Bunuel
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Bismuth83
1. The highest cost of ethanol was about $3.25 (Jan-13) and the lowest cost of corn was about $3 (Jan-16). So, it is \(\frac{3.25 - 3}{3} * 100\% \approx 8.33\%\), which is closest to the answer choice 15%.

2. The cost of gasoline is about $3 at the end and about $1 at the beginning. So, it was approximately triple of what it was.

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Note that these estimations can result in very different answers but the answer choice that best matches it will stay the same. For example, in the second case we can better estimate it to be \(\frac{3.40}{0.80} = 4.25\) but it's still closest to 3.
it was not 3.4, you're looking at the wrong axis. it went from 0.8 to 1.8, it more than doubled. It definitely didn't triple and most certainly didn't more than quadruple
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