Posted by Jose on Wednesday, January 27, 2010 at 9:23pm.
I think I am reading this wrong but this may not be a Calculus question.
<= means less than or equal to
>= means greater than or equal to
Rates
20*x 0 < x < 50
20-0.02*x 50 <= x <= 600
When buying 1-49 articles, it is $20 per article.
When buying 50-600 articles, it is $(20-.02*x).
As you buy more, the cheaper it gets until you reach 600, then it maintains at that cost which is $8 dollars per article.
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