Chapter 11.3, Problem 63E

To determine

(a)

To find:

A system of equations in $x$, $y$, and $z$.

To determine

(b)

To express:

The system of equation found in part (a) as a matrix equation of the form $AX=B$

To determine

(c)

To find:

The inverse of the coefficient matrix $A$ and use it to solve the matrix equation in part (b). The commission earned by the sales woman on each model of cell phone