Question

To determine the cost of production when the price is $9, you would:

Answer 1

Since D(p) gives the number of items, it can be used as an argument of the function C(x), because x is also the number of items. Then, we can write

x = D(p) : number of items when the price is p

C(x) = C(D(p)) : cost when the price is p

Therefore, when the price is 9, to find the cost we can:

Evaluate C(D(9))