Suppose that a firm produces three outputs y1, y2 and y3 with 3 inputs z1, z2 and z3. The input-output requirements matrix is given by A below:
(3 1 2)
A = (2 5 1)
(1 1 3)
If the firm wants to produce 10 units of y1, 20 units of y2 and 10 units of y3, how much of z1, z2 and z3 will it require?