An industrial production process costsC(q) million dollars to produceq million units; these units then sell forR(q) million dollars.

IfC(2.1)=5.4,R(2.1)=6.6,MC(2.1)=0.5, andMR(2.1)=0.6, calculate the following

(a)The profit earned by producing2.1 million units.

The profit is_______ million dollars.

(b)The approximate change in revenue if production increases from2.1 to2.12 million units.

The change in revenue is about________thousand dollars.

(c)The approximate change in revenue if production decreases from2.1to2.03 million units.

The change in revenue is about_______ thousand dollars.

(d)The approximate change in profit in parts(b)and(c).

The change in profit in part(b)is about______ thousand dollars, and the change in profit in part(c)is about______ thousand dollars.