If the Cost Function for Producing a Product Is $C ( x ) = x ^ { 3 } - \frac { 1 } { 2 x ^ { 2 } } + 3 x + 2$

Multiple Choice

If the cost function for producing a product is $C ( x ) = x ^ { 3 } - \frac { 1 } { 2 x ^ { 2 } } + 3 x + 2$ find the answer closest to the marginal cost at a production level of 10 units.

A) -697
B) 30
C) 293
D) 297
E) 697