The price of a gallon of unleaded gas has dropped to $2.81 today. Yesterday's price was $2.86 . Find the percentage decrease. Round your answer to the nearest tenth of a percent.

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The price of a gallon of unleaded gas has dropped to $2.81 today. Yesterday's price was $2.86 . Find the percentage decrease. Round your answer to the nearest tenth of a percent.

Mathematics
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how do i add fractions?
To find the percentage decrease, you need to first find the decrease, and then find how much that is in relationship to the original value. It dropped from $2.86 to $2.81, so the decrease is $0.05. You divide the decrease, $0.05, with the original price, $2.86, to find the percentage decrease. Multiply that value by 100 to get the value in percent.
I'm still bad with that kind of percents, but I kept a few notes on how to find the whole, part, or percent of a number. I think you divide the part by the whole.

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part/whole = decimal percentage; x100 to get a normal percentage number
2.81 1- ---- = decimal percentage 2.86 decimal(100) = normal looking percentage :)
1.74... %
I divide the part by the whole then move the decimal 2 places to the right, which then becomes the percent.
of course then I would round the answer.
moving the decimal is not really a mathmatical solution; its more of a memory device :) but yes...
Heh, just something my teacher taught me. If there's a more precise way, I don't know it yet XD
for example: .26 = 26/100 26 ---- (100) = 26 is the math way; the memory way is 100 'move the decimal'

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