The price of a gallon of unleaded gas was $2.89 yesterday. Today, the price fell to $2.82 . Find the percentage decrease. Round your answer to the nearest tenth of a percent
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Percentage decrease can be found by taking: |original-new|/original where the original price is $2.89 and the new price is $2.82
yest price = 2.89
today = 2.82
diff in price = 0.07
this is the difference for $2.89
think this way...
the difference for $2.89 -----> $0.07
what is the diff for $100 -----> ? ( percent is for 100 right!?)
obviously it's gonna be more, more than 0.07, right?
i'd only look at the numbers now
$2.89 -----> $0.07
$100 -----> ?
(100/2.89) * 0.07
therefor the percent of decrease is 2.42%