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26 May 2022, 04:15
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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:
35%
(medium)
Question Stats:
67% (01:07) correct
33%
(01:30)
wrong
based on 24
sessions
History
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Joe acquired n identical rare coins for 1,000 dollars each. Suppose the price at which he sells each coin is 5000 – 20n, what would his total profit be, in dollars?
A. 4,000n – 20n2
B. 5,000 – 20n2
C. 4,000 – 20n
D. (4,00 - 20n)/n
E. 5000 – 1020n
A. 4,000n – 20n2
B. 5,000 – 20n2
C. 4,000 – 20n
D. (4,00 - 20n)/n
E. 5000 – 1020n
26 May 2022, 09:45
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Bunuel
Joe acquired n identical rare coins for 1,000 dollars each. Suppose the price at which he sells each coin is 5000 – 20n, what would his total profit be, in dollars?
A. 4,000n – 20n2
B. 5,000 – 20n2
C. 4,000 – 20n
D. (4,00 - 20n)/n
E. 5000 – 1020n
A. 4,000n – 20n2
B. 5,000 – 20n2
C. 4,000 – 20n
D. (4,00 - 20n)/n
E. 5000 – 1020n
An opportunity to use BOTH Plugging In AND Ballparking? Don't mind if I do!!
There's a variable in the question that is repeated in the answer choices, so let's Plug In. Let's make n=3.
Joe bought his coins for a total of $3000.
He sold them for 5000-20(2) each, so 4960. Really? How about ballparking that to $5000, remembering that we want something just a little smaller, and seeing if we get close enough?
Total revenue was just a little smaller than 15000 and total expense was 3000, so profit was just a little smaller than 12000.
Let's check the answer choices.
(A) 12000 minus something pretty small. Keep it.
(B) 5000 minus something. Too small. Wrong.
(C) 4000 minus something. Too small. Wrong.
(D) (4000 minus something)/3. Too small. Wrong.
(E) 5000 minus roughly 3000. Too small. Wrong.
Answer choice A.
ThatDudeKnowsPluggingIn
ThatDudeKnowsBallparking
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