Question

Two stores sell the same computer for the same original price. Store A advertises that the computer is on sale for 25% off the original price. Store B advertises that it is reducing the computer’s price by $180. When Brittany compares the sale prices of the computer in both stores, she concludes that the sale prices are equal.

Which equation models this situation?

Let p represent the computer’s original price.

A.
0.25p = p – 180

B.
0.75p = p + 180

C.
0.25(p – 180) = p

D.
0.75p = p − 180

Answer 1

Do you have any guesses?

Answer 2

yea

Answer 3

c

Answer 4

i didnt really understand what you just said

Answer 5

Something like this?

If you give me $1 and I give you back 75 cents then that's the same as taking 25% of your original $1.

Now, if you want to compare the two quantities, compare the 75 cents you got back to the 25% you lost. They are equal. why?

Answer 6

ohh so you want me to tell you why 75 cents and a doller are equal?

Answer 7

Here we have 0.75 of 1 dollar (p) equals 75 cents

How do you represent that?

Answer 8

@ybarrap im not good with money i didnt want to tell you becase i didnt want to sound dumb as a box of rocks.

Answer 9

i was reading that :(

Answer 10

0.75 of one dollar is the same as 25% less than one dollar

So if p is the amount you have and something is 25 percent less than that then for them to be equal

0.75p=p-180

Because when you remove 25% of something your are left with 75% of it or 0.75*p and that must equal $180 for them to be the same.

We subtracted 180 from p because, with the sales price, it will be less than p (the price) by 180 dollars.

Answer 11

thanks :)

Answer 12

I hope this makes sense - if something is on sale, the final price will be less, so p+180 makes no sense because then we would be paying MORE for something on sale - weird.

YW

Answer 13

lol true

Answer 14

@ybarrap is it ok if we do practic problems some time?

Answer 15

definitely