Question

how do you figure an original price if you are 180$ less than the original price after it has been decreased by 20% twice.

Answer 1

Hoot! You just asked your first question! Hang tight while I find people to answer it for you. You can thank people who give you good answers by clicking the 'Good Answer' button on the right!

Answer 2

20% twice eh... gotta read the whole thing

Answer 3

180 = P(1 - .2)^2

180
----- = P perhaps?
(.8)^2

180/.64 = 281.25 ; lets test that

Answer 4

281.25(.8) =225

225(.8) = 180

Answer 5

they say the answer is 500 If I reduce 500 by 20% twice I get 180. but I can do the reverse?

Answer 6

...... lets see what they are talking about then

500*.8 = 400 ... i dont see it as 500

Answer 7

500*.2 = 100

and at best that gets you to 300

Answer 8

Original Price (.8) = sale price at 20% 0ff

Answer 9

if its marked down twice from the original price wed still be less than 500

Answer 10

Original Price(.6) = 40% off original

and thats 300 at best

Answer 11

500x.20=100
500-100=400
400x.20=80
400-80=320
320+180=500 ...how do I do it in reverse if all I know is the price was reduce 180$ after been decreased by 20% twice.

Answer 12

Price paid
-------------- = Original Price
(1- %)^how often


180
-------- = 281.25
(1 - .2)^2

Answer 13

I have no idea what that means/ sorry

Answer 14

... which part?

Answer 15

Do you know how much was paid?

Answer 16

no only reduce by 180$ after 20% decrease twice

Answer 17

ohhh; i read it wrong... I thought 180 was the amount paid....

Answer 18

P(.2) = Amount reduced

Amount reduced(.2) = 180 is what yor looking for right?

Answer 19

the amount was reduce twice by 20% ??? was reduced by 180$ what the original amount

Answer 20

close to it

Answer 21

What does this symbol mean ^

Answer 22

its how you indicate an exponent on a keyboard

Answer 23

it point up to tell you the number is a little higher

Answer 24

OH

Answer 25

3^2 = 9

Answer 26

A{n} = A{n-1} - A{n-1}(.2)

A{n-1} = A{n-2}(.2) - A{n-2}(.2)(.2) maybe

Answer 27

Thanks but it just doesn't make any sense

Answer 28

its a work in progress :) but I think I narrowed it down tho this:

Answer 29

Po(.2) = %off1

Po(.8) = saleprice

saleprice(.2) = %off 2

%off1 + %off2 = 180

Answer 30

Po(.2) + Po(.8)(.2) = 180

Po(.2 + .16) = 180

Po = 180/(.36) maybe?

Answer 31

Po = 180/.36 = 500

Answer 32

were did the .36 com from

Answer 33

.2 + .16 = .36

Answer 34

First step; lets agree that the steps I took are valid..

Po(.2) = %off1 agree?

Answer 35

yes

Answer 36

Po(.8) = sale price

sale price (.2) = %off2 agree?

Answer 37

OK

Answer 38

%off1 + %off2 = 180

Po(.2) + Po(.8)(.2) = 180 agree?

Answer 39

yes

Answer 40

Po(.2) + Po(.16) = 180

Po(.2 + .16) = 180

Po(.36) = 180 agree?

Answer 41

where did the .16 come from

Answer 42

.8 times .2 = .16

Answer 43

Po(.8)(.2) = Po(.16)

Answer 44

how would I know to do that.....makes no sense

Answer 45

.......... I really cant step this down much further.

You know that Po(.8) = sale price ; and also that sale price(.2) = %off2

So we put that all together to get:

Po(.8)(.2) = Po(.16)

Answer 46

looks like a lot of people like your help, amistre can you help with my trignometric substitution problem?

Answer 47

I can try :)

Answer 48

cool meet you there, thanks so much

Answer 49

thanks sorry to hold you to long

Answer 50

'sok.... the math keeps :)

Answer 51

do you see how it works thru that?

all we did was define our steps, then added the Po to it to keep track of the 'original price'

Answer 52

if we know how the original price plays a part in this; we can solve for it

Answer 53

when I add the % I total 100%. never though of multiply them...still don;t know why you would mulitpy them

Answer 54

Po(.8) = sale price ; sale price (.2) = %off2
^^^^^^^^^^^^^^^^^
this part is redundant
so remove it


Po(.8)(.2) = %0ff2

Answer 55

my test says the answer is 500=original price

Answer 56

your test is correct....

why? because 180/.36 = 500

Answer 57

Po(.8)(.2) = Po(.16) = %off2

Answer 58

Po(.2) = %off1
Po(.16) = %off2

%off1 + %off2 = 180

Po(.2) + Po(.16) = 180

Answer 59

I see... 20% off the first time and 16% off the second time.....I would of never figured that out?????

Answer 60

its not really 16% off :) Its just that that what it amounts to to figure this out ;)

Answer 61

actually, your spot on it lol

Answer 62

How about another one,,,
ticket sales have gone up 10% reaching 880 tickets how many ticket were sold in the last season.
my answer is 792 but its wrong

Answer 63

wish I could try it, but library is closing...good luck :)