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percent

by Gurpinder » Sun Aug 15, 2010 5:55 pm
a stereo was marked down by 30% and sold for $84. what was the pre-sale price of the stereo?

.3x=84
280

why is this wrong?
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by selango » Sun Aug 15, 2010 9:02 pm
x-0.3x=84

0.7x=84

x=120
--Anand--

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by Tani » Mon Aug 16, 2010 3:14 pm
If you are unsure of a percent problem, try working backward from your answer.

If the stereo started at $280 and was marked down by 30%, that would be a reduction of $84 leaving a price of $196, not $84.

I suspect you misread the problem. The stereo was marked down BY 30%, not TO 30%.
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by Gurpinder » Mon Aug 16, 2010 7:04 pm
Tani Wolff - Kaplan wrote:If you are unsure of a percent problem, try working backward from your answer.

If the stereo started at $280 and was marked down by 30%, that would be a reduction of $84 leaving a price of $196, not $84.

I suspect you misread the problem. The stereo was marked down BY 30%, not TO 30%.
So Tani,

$84 is the price after the 30% reduction right??
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by Tani » Mon Aug 16, 2010 7:28 pm
Correct :-)
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by Gurpinder » Mon Aug 16, 2010 7:41 pm
Tani Wolff - Kaplan wrote:Correct :-)

AHHHH I see what I was doing wrong. I took $84 to be 30% whereas 84$ is the 70% of the original price

so the equation would be .7x=84 > x=120

thank you for your help!
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by Tani » Mon Aug 16, 2010 8:02 pm
Exactly! :-)
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Re: percent

by [email protected] » Mon Mar 09, 2020 3:45 am
Gurpinder wrote:
Sun Aug 15, 2010 5:55 pm
a stereo was marked down by 30% and sold for $84. what was the pre-sale price of the stereo?

.3x=84
280

why is this wrong?
Letting n = the presale price of the stereo, we can create the following equation:

0.7n = 84

n = 120

Answer: D

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Re: percent

by Ignite » Sat Aug 01, 2020 9:30 pm
The stereo was marked down by 30%.

Let its original price be X.
So, 100% = X

If it's down by 30% then 70% of it is remaining.
So 70% of X is the price it got sold for.

Thus, 0.7X = 84
Or, X = 120




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