For the Cost Function, Find the Marginal Cost at the Given

Multiple Choice

For the cost function, find the marginal cost at the given production level x. Round your answer to two decimal places.
$C ( x ) = 30,000 + 10 x - \frac { x ^ { 2 } } { 10,000 } , x = 2,000$

A) $9.60 per item
B) $9.58 per item
C) $10.00 per item
D) $9.61 per item
E) $10.40 per item