anonymous
  • anonymous
how do you figure an original price if you are 180$ less than the original price after it has been decreased by 20% twice.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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Owlfred
  • Owlfred
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amistre64
  • amistre64
20% twice eh... gotta read the whole thing
amistre64
  • amistre64
180 = P(1 - .2)^2 180 ----- = P perhaps? (.8)^2 180/.64 = 281.25 ; lets test that

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More answers

amistre64
  • amistre64
281.25(.8) =225 225(.8) = 180
anonymous
  • anonymous
they say the answer is 500 If I reduce 500 by 20% twice I get 180. but I can do the reverse?
amistre64
  • amistre64
...... lets see what they are talking about then 500*.8 = 400 ... i dont see it as 500
amistre64
  • amistre64
500*.2 = 100 and at best that gets you to 300
amistre64
  • amistre64
Original Price (.8) = sale price at 20% 0ff
amistre64
  • amistre64
if its marked down twice from the original price wed still be less than 500
amistre64
  • amistre64
Original Price(.6) = 40% off original and thats 300 at best
anonymous
  • anonymous
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.
amistre64
  • amistre64
Price paid -------------- = Original Price (1- %)^how often 180 -------- = 281.25 (1 - .2)^2
anonymous
  • anonymous
I have no idea what that means/ sorry
amistre64
  • amistre64
... which part?
amistre64
  • amistre64
Do you know how much was paid?
anonymous
  • anonymous
no only reduce by 180$ after 20% decrease twice
amistre64
  • amistre64
ohhh; i read it wrong... I thought 180 was the amount paid....
amistre64
  • amistre64
P(.2) = Amount reduced Amount reduced(.2) = 180 is what yor looking for right?
anonymous
  • anonymous
the amount was reduce twice by 20% ??? was reduced by 180$ what the original amount
amistre64
  • amistre64
close to it
anonymous
  • anonymous
What does this symbol mean ^
amistre64
  • amistre64
its how you indicate an exponent on a keyboard
amistre64
  • amistre64
it point up to tell you the number is a little higher
anonymous
  • anonymous
OH
amistre64
  • amistre64
3^2 = 9
amistre64
  • amistre64
A{n} = A{n-1} - A{n-1}(.2) A{n-1} = A{n-2}(.2) - A{n-2}(.2)(.2) maybe
anonymous
  • anonymous
Thanks but it just doesn't make any sense
amistre64
  • amistre64
its a work in progress :) but I think I narrowed it down tho this:
amistre64
  • amistre64
Po(.2) = %off1 Po(.8) = saleprice saleprice(.2) = %off 2 %off1 + %off2 = 180
amistre64
  • amistre64
Po(.2) + Po(.8)(.2) = 180 Po(.2 + .16) = 180 Po = 180/(.36) maybe?
amistre64
  • amistre64
Po = 180/.36 = 500
anonymous
  • anonymous
were did the .36 com from
amistre64
  • amistre64
.2 + .16 = .36
amistre64
  • amistre64
First step; lets agree that the steps I took are valid.. Po(.2) = %off1 agree?
anonymous
  • anonymous
yes
amistre64
  • amistre64
Po(.8) = sale price sale price (.2) = %off2 agree?
anonymous
  • anonymous
OK
amistre64
  • amistre64
%off1 + %off2 = 180 Po(.2) + Po(.8)(.2) = 180 agree?
anonymous
  • anonymous
yes
amistre64
  • amistre64
Po(.2) + Po(.16) = 180 Po(.2 + .16) = 180 Po(.36) = 180 agree?
anonymous
  • anonymous
where did the .16 come from
amistre64
  • amistre64
.8 times .2 = .16
amistre64
  • amistre64
Po(.8)(.2) = Po(.16)
anonymous
  • anonymous
how would I know to do that.....makes no sense
amistre64
  • amistre64
.......... 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)
anonymous
  • anonymous
looks like a lot of people like your help, amistre can you help with my trignometric substitution problem?
amistre64
  • amistre64
I can try :)
anonymous
  • anonymous
cool meet you there, thanks so much
anonymous
  • anonymous
thanks sorry to hold you to long
amistre64
  • amistre64
'sok.... the math keeps :)
amistre64
  • amistre64
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'
amistre64
  • amistre64
if we know how the original price plays a part in this; we can solve for it
anonymous
  • anonymous
when I add the % I total 100%. never though of multiply them...still don;t know why you would mulitpy them
amistre64
  • amistre64
Po(.8) = sale price ; sale price (.2) = %off2 ^^^^^^^^^^^^^^^^^ this part is redundant so remove it Po(.8)(.2) = %0ff2
anonymous
  • anonymous
my test says the answer is 500=original price
amistre64
  • amistre64
your test is correct.... why? because 180/.36 = 500
amistre64
  • amistre64
Po(.8)(.2) = Po(.16) = %off2
amistre64
  • amistre64
Po(.2) = %off1 Po(.16) = %off2 %off1 + %off2 = 180 Po(.2) + Po(.16) = 180
anonymous
  • anonymous
I see... 20% off the first time and 16% off the second time.....I would of never figured that out?????
amistre64
  • amistre64
its not really 16% off :) Its just that that what it amounts to to figure this out ;)
amistre64
  • amistre64
actually, your spot on it lol
anonymous
  • anonymous
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
amistre64
  • amistre64
wish I could try it, but library is closing...good luck :)

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