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From July 1, 1980 to July 1, 1990, the closing price of a share of sto

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From July 1, 1980 to July 1, 1990, the closing price of a share of sto  [#permalink]

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New post 28 Aug 2017, 04:05
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Question Stats:

79% (00:59) correct 21% (00:59) wrong based on 39 sessions

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From July 1, 1980 to July 1, 1990, the closing price of a share of stock X doubled. What was the closing price of a share of stock X on July 1, 1990?

(1) From July 1, 1980 to July 1, 1990, the closing price of a share of stock X increased by $2
(2) From July 1, 1980 to July 1, 1985, the closing price of a share of stock X tripled

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Re: From July 1, 1980 to July 1, 1990, the closing price of a share of sto  [#permalink]

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New post 28 Aug 2017, 04:17
Bunuel wrote:
From July 1, 1980 to July 1, 1990, the closing price of a share of stock X doubled. What was the closing price of a share of stock X on July 1, 1990?

(1) From July 1, 1980 to July 1, 1990, the closing price of a share of stock X increased by $2
(2) From July 1, 1980 to July 1, 1985, the closing price of a share of stock X tripled


(1) 1980 = 2 to 1990 = 4
sufficient

(2) no details abt 1990
not sufficient

A
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From July 1, 1980 to July 1, 1990, the closing price of a share of sto  [#permalink]

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New post 28 Aug 2017, 05:25
From July 1, 1980 to July 1, 1990, the closing price of a share of stock X doubled.
that means if on July 1 1980, the value is 10, On July 1 1990 the value will be 20.

S1 says value increased by $2. 2x = x+2;
x=2; implies value on July 1 1980 is 4. Sufficient.

S2 provides no info on value in 1980 or 1990

Ans :A
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Re: From July 1, 1980 to July 1, 1990, the closing price of a share of sto  [#permalink]

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New post 28 Aug 2017, 21:09
I am so careless. I thought we need the initial price for the stock
but actually we already can form a formula from statement 1,
2x=x+2
x=2
so the final price is 4
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From July 1, 1980 to July 1, 1990, the closing price of a share of sto  [#permalink]

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New post 29 Aug 2017, 04:42
1980- X
1990 - 2x

A) 2x-x=2
x=2

B) No info about 1990

So it should be A
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From July 1, 1980 to July 1, 1990, the closing price of a share of sto   [#permalink] 29 Aug 2017, 04:42
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From July 1, 1980 to July 1, 1990, the closing price of a share of sto

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