Question

By multiplying matrices, calculate the matrix for total dollar volume of sales.


I know how to multiply matrices, but this question makes absolutely no sense. What do I multiply?

Answer 1

linear combination of columns cr*C1+cp*C2

Answer 2

But if you did that, how would the determinant be found? That makes no sense how that can be found if it is in the rows and columns like that. So in thousands, would the first be 10000,000?

Answer 3

that is not determinant