Your Weekly Cost (In Dollars) to Manufacture X Cars and Y

Multiple Choice

Your weekly cost (in dollars) to manufacture x cars and y trucks is given by $C ( x , y ) = 300,000 + 6,500 x + 4,500 y$
Find $\frac { \partial C } { \partial x }$ , and $\frac { \partial C } { \partial y }$ .

A) $\frac { \partial C } { \partial x } = 4,500$ , $\frac { \partial C } { \partial y } = 6,500$
B) $\frac { \partial C } { \partial x } = 11,000$ , $\frac { \partial C } { \partial y } = 2,000$
C) $\frac { \partial C } { \partial x } = 300,000$ , $\frac { \partial C } { \partial y } = 300,000$
D) $\frac { \partial C } { \partial x } = 6,500$ , $\frac { \partial C } { \partial y } = 4,500$
E) $\frac { \partial C } { \partial x } = - 6,500$ , $\frac { \partial C } { \partial y } = - 4,500$