Question 1175791
.


This part of your question   " C(90,00) "  is written in absurdist format,


which is not consistent with the rest of the question and makes  ANY  SOLUTION  nonsensical.




Please revise your question,  fix it,  write appropriately and then re-submit to the forum.



Do not accept any solution,  until you present the problem in the proper form.



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                        O-o-o (!)



After my post, somebody shamefacedly just fixed the numbers in your post.



Now the solution is in one line


<pre>
    C(90,000) = 0.3*90000 + 27000 = 54,000  dollars.     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>
</pre>

Solved.


Do not accept any other answer.



............


Hey, the solution is so simple: substitute and calculate.


Can you reveal me your secret --- for what reason did you post so simple task to the forum ?