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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
85% (01:02) correct
15%
(01:10)
wrong
based on 60
sessions
History
Date
Time
Result
Not Attempted Yet
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
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
(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
Gentle note to all experts and tutors: Please refrain from replying to this question until the Official Answer (OA) is revealed. Let students attempt to solve it first. You are all welcome to contribute posts after the OA is posted. Thank you all for your cooperation!
15 Jul 2025, 02:01
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Let the closing price of a share of stock X be x on July 1, 1980
The closing price of a share of stock X be x on July 1, 1990 = 2x
2x=?
Need to find x
S1
From July 1, 1980 to July 1, 1990, the closing price of a share of stock X increased by $2
2x-x=2
x=2
Sufficient
S2
From July 1, 1980 to July 1, 1985, the closing price of a share of stock X tripled
No info on closing price of a share of stock X be x on July 1, 1990
The stocks go up and down. It's not mentioned anywhere that it increased at a constant rate for us to extrapolate
Insufficient
Answer A
The closing price of a share of stock X be x on July 1, 1990 = 2x
2x=?
Need to find x
S1
From July 1, 1980 to July 1, 1990, the closing price of a share of stock X increased by $2
2x-x=2
x=2
Sufficient
S2
From July 1, 1980 to July 1, 1985, the closing price of a share of stock X tripled
No info on closing price of a share of stock X be x on July 1, 1990
The stocks go up and down. It's not mentioned anywhere that it increased at a constant rate for us to extrapolate
Insufficient
Answer A
Bunuel
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