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Rate of Change of Demand and Revenue

The Manager of a company that produces graphing calculators determines that when x thousand calculators are produced, they will all be sold when the price is p(x)=1,000/0.3x^2+8 dollars per calculator.

A. At what rate is demand p(x) changing with respect to the level of production x when 3,000(x=3) calculators are produced?

B. The revenue derived from the sale of x thousand calculators is R(x)=xp(x) thousand dollars. At what rate is revenue changing when 3,000 calculators are produced? Is revenue increasing or decreasing at this level of production?

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