# Percentage question #2.

• Sep 11th 2009, 11:12 PM
dtay
Percentage question #2.
(Crying)Shop A sells a dress for $280. This is 12% more than the price of a similar dress in shop B. (a) Find the price of the dress in Shop B. (b) During a sale, both shops offered an equal percentage discount on the dress. Doris bought the dress in Shop B and found that she paid$22.80 less than the discounted price in Shop A. What was the
percentage discount?
• Sep 11th 2009, 11:21 PM
running-gag
Hi

Let x be the price of the dress in shop B

The price of the dress in shop A ($280) is 12% more than x$\displaystyle 280 = x \left(1 + \frac{12}{100}\right)$From this equation you can get the value of x • Sep 11th 2009, 11:23 PM dtay Quote: Originally Posted by running-gag Hi Let x be the price of the dress in shop B The price of the dress in shop A ($280) is 12% more than x

$\displaystyle 280 = x \left(1 + \frac{12}{100}\right)$

From this equation you can get the value of x

so what is the answer? i havent learnt this kind of equation yet , sorry):
• Sep 11th 2009, 11:26 PM
mr fantastic
Quote:

Originally Posted by dtay
so what is the answer? i havent learnt this kind of equation yet , sorry):

Are you saying you haven't learned how to add $\displaystyle 1 + 12/100$ and you haven't learned how to solve an equation like 280 = ax for x?

You're expected to make some sort of effort after being given help.
• Sep 11th 2009, 11:37 PM
dtay
Quote:

Originally Posted by mr fantastic
Are you saying you haven't learned how to add $\displaystyle 1 + 12/100$ and you haven't learned how to solve an equation like 280 = ax for x?

You're expected to make some sort of effort after being given help.

I havent learned how to solve an equation like 280 = ax for x. Sorry . I am still in elementary 4.
• Sep 11th 2009, 11:59 PM
mr fantastic
Quote:

Originally Posted by dtay
I havent learned how to solve an equation like 280 = ax for x. Sorry . I am still in elementary 4.

Mathematics is an extremely sequential subject. Until you learn how to solve an equation like this (that is, a simple linear equation) you shouldn't be trying to solve a problem like the one you posted.
• Sep 12th 2009, 12:04 AM
Finley
For part B, I'll break it down to a point where I believe it's simple enough for you to solve by yourself. :)

$\displaystyle (280*(1-x))-(250*(1-x))=22.8$
$\displaystyle 280-280x-250+250x=22.8$
$\displaystyle 30-30x=22.8$
$\displaystyle -30x=-7.2$

Can you take it from there?