An industrial production process costs C(q) million dollars to produce q million units; these units then sell for R(q) million dollars. If C(2.1)=5.1 R(2.1)=6.6, MC(2.1)=0.8 and MR(2.1)=0.9 calculate the following.
(a) The profit earned by producing 2.1 million units.
(b) The approximate change in revenue if production increases from 2.1 to 2.12million units.
(c) The approximate change in revenue if production decreases from 2.1 to 2.04million units.
(d) The approximate change in profit in parts (b) and (c).

Question

An industrial production process costs C(q) million dollars to produce q million units; these units then sell for R(q) million dollars. If C(2.1)=5.1 R(2.1)=6.6, MC(2.1)=0.8 and MR(2.1)=0.9 calculate the following. 
(a) The profit earned by producing 2.1 million units. 
(b) The approximate change in revenue if production increases from 2.1 to 2.12million units. 
(c) The approximate change in revenue if production decreases from 2.1 to 2.04million units. 
(d) The approximate change in profit in parts (b) and (c).