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# Each writer for the local newspaper is paid as follows: a

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Joined: 25 Sep 2006
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Each writer for the local newspaper is paid as follows: a [#permalink]  25 Sep 2006, 20:27
Each writer for the local newspaper is paid as follows: a dollars for each of the first n stories each month, and a +b for each story thereafter, where a>b. how many more dollars will a writer who submits n+a stories in a month earn than a writer who submits n+b stories?

1. (a-b)(a+b+n)
2. a-b
3. a^2-b^2
4. n(a-b)
5. an+bn-an

Thanks!
Senior Manager
Joined: 14 Aug 2006
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Ans: C : a^2 - b^2

For the first n stories he gets a dollars each;

for n+a stories = na + a(a+b)

for n+b stories = na + b(a+b)

difference: a^2 - b^2
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