The Monthly Cost C of Running the Machinery in a Factory

Multiple Choice

The monthly cost C of running the machinery in a factory for t hours is given by​ $C ( t ) = 40 t + 400$ The number of hours t needed to produce x products is given by $t ( x ) = 6 x$ . Find the equation representing the cost C of manufacturing x products.

A) $C ( x ) = 46 x + 440$
B) $C ( x ) = 240 x + 16,000$
C) $C ( x ) = 40 x + 406$
D) $C ( x ) = 46 x + 400$
E) $C ( x ) = 240 x + 400$ ​