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Mathematics 7 Online
OpenStudy (anonymous):

A sign in a clothing store said, "All prices reduced 25% . Final prices marked on tags." DeLea found a sweatshirt that showed a price of $27. What was the original price of the sweatshirt? A. $27.25 B. $33.75 C. $36.00 D. $52.00

OpenStudy (anonymous):

To be sure, is this 2.5 percent, or 25?

OpenStudy (anonymous):

its 25%

OpenStudy (anonymous):

Okay so I just reread what I saw from iluvlucy and I was wrong, you need to multiply the two numbers, and then try and figure it out from there.

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

Now remember, normally you would have divided the numbers to get the second part of your answer, but since it's a decimal you have to multiply. So the multiplication only attends to the decimals and I'm pretty sure on fractions, anyone want to help me out on the fractions? I hate giving out wrong information.

OpenStudy (amistre64):

\[$-$\%=cost\] \[$(1-\%)=cost\] \[$=\frac{cost}{1-\%}\]

OpenStudy (anonymous):

Rewriting your equation here amistre maybe this is more simply put: \[% * discount cost = % taken off original then simply + your % taken off \to the discount price.\]

OpenStudy (anonymous):

i got 6.75

OpenStudy (anonymous):

That is correct ebso, that is the discount in $ form, now what should you do to get your original price from discount?

OpenStudy (anonymous):

Lol, Uh divide 6.75 & 25% ????

OpenStudy (anonymous):

No, instead think of it this way: x = 6.75 z = original cost 27 + x = z now what does z equal?

OpenStudy (anonymous):

33.75?

OpenStudy (anonymous):

Good job, that's correct!

OpenStudy (anonymous):

Kk, Thanks ! :)

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