67. Limited manufactures specialist medical equipment. Recruitment and training of manufacturing staff is difficult and C's operations management estimates that only 160 000 hours of labour at a rate of $50 per hour will be available in the next financial year. The following details relate to C's planned production of three products X, Y and Z for the next 12 months.

x y z

selling price 65 315 200

materials cost 10 50 40

labour hours 1 5 3

maximum demand 100,000 20,000 25,000

To maximise profits the products C should manufacture are:

A.Y then Z.

B.Y then Z, then X.

C.X then Z. (explain why )

D.X then Z, then Y.