Company $xYZ$ planned to invest $$20$ million in a new digital camera project. After the initial $5$ million dollars were invested, the company realized that cellphones with cameras has become increasingly popular among consumers and this may significantly reduce the demand for their new digital cameras. After collecting data and revising the demand for the new cameras, the estimated sales at completion of the project would be $$12$ million.

The company needs to decide whether to continue with the project. What is the marginal cost of continuing with and complete the project?

$$5$ million

$$12$ million

$$20$ million

$$15$ million