First of all, I don't think you meant to type the equation as you did, or else why not reduce it to
C = 3000 - 2x^2
So I will assume you meant
C = 6000/(200-2x^2)
Secondly, the way you defined x % , we would have to replace x with 20, and then your result would be
C = 6000/(200 - 800) which will result in a negative cost, thus making no sense.
If we replace 20% with 0.2, we would get
C = 6000/(200 - .08) = 30.012
but the cost of removing 90% would then be
6000/(200 - 1.62) = 30.24
which is only slightly higher than removing 20%.
This does not make sense to me, so please check the typing of the equation, and the definition of x
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