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# Joe acquired n identical rare coins for 1,000 dollars each. Suppose th

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Math Expert
Joined: 02 Sep 2009
Posts: 58464
Joe acquired n identical rare coins for 1,000 dollars each. Suppose th  [#permalink]

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17 Oct 2019, 00:23
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Difficulty:

45% (medium)

Question Stats:

64% (01:14) correct 36% (00:53) wrong based on 14 sessions

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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

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Re: Joe acquired n identical rare coins for 1,000 dollars each. Suppose th  [#permalink]

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17 Oct 2019, 00:32
Cost Price $$= 1000n$$
Selling Price $$= (5000-20n)*n = 5000n - 20n^2$$

Profit = Selling Price - Cost Price $$= 5000n-20n^2-1000n = 4000n-20n^2$$

Re: Joe acquired n identical rare coins for 1,000 dollars each. Suppose th   [#permalink] 17 Oct 2019, 00:32
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# Joe acquired n identical rare coins for 1,000 dollars each. Suppose th

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