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It costs $1,000 to make the first thousand copies of a book and x doll

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Bunuel
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It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   24 Oct 2017, 01:51
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It costs $1,000 to make the first thousand copies of a book and x dollars to make each subsequent copy. If it costs a total of $7,230 to make the first 8,000 copies of a book, what is x?

(A) .89
(B) .90375
(C) 1.00
(D) 89
(E) 90.375
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   24 Oct 2017, 03:01
$x for each copy after 1000 copies.
$7230 dollars to make 8000 copies => $1000 for the first 1000 copies and $6230 for the rest 7000 copies
x = 6230/7000 = $0.89

Answer is A.
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   24 Oct 2017, 04:06
A

It costs a total of $7,230 to make the first 8,000 copies of a book.
It costs $1,000 to make the first thousand copies of a book and x dollars to make each subsequent copy.

Thus, (8000-1000)*x = 7230-1000 dollars
7000x = 6230
x = 0.89 dollars
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   26 Oct 2017, 15:48
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Bunuel wrote:
It costs $1,000 to make the first thousand copies of a book and x dollars to make each subsequent copy. If it costs a total of $7,230 to make the first 8,000 copies of a book, what is x?

(A) .89
(B) .90375
(C) 1.00
(D) 89
(E) 90.375


We can create the following equation:

7230 = 1000 + 7000x

6230 = 7000x

6230/7000 = x

x = 6.23/7 = 0.89

Answer: A
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   30 Jan 2021, 18:01
1000 + (n - 1,000)*x = 7,230

x = .89

Answer A
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink] New post   30 Jan 2021, 22:53
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$1,000 = first 1000 copies
x dollars = each subsequent copy

Total copies: 8,000

=> Susbequent copies: 8,000 - 1,000 = 7,000

=> Total cost: $7,230

=> Cost of first thousand copies: 1,000

=> Cost of subsequent 7,000 copies = 7,230 - 1,000 = 6,230

=> 7,000 * x = 6,230

=> x = 0.89

Answer A
If it costs a total of $7,230 to make the first 8,000 copies of a book, what is x?
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Re: It costs $1,000 to make the first thousand copies of a book and x doll [#permalink]
30 Jan 2021, 22:53
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