On January 1, 2013, at a price of x dollars, the demand for a certain product was

D(x) =
300
x2 + 10px thousand units per month. t months after January 1, 2013, it is
estimated that the price of the product will be x(t) = 3t4/3 +16 dollars. At what rate
is the demand changing on September 1, 2013? Round your answer to two decimal
places.

i got 0.60 thousand units per month, can someone check that? thanks!

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