(Production Planning) A manufacturer makes three different types of chemical
products: A, B. and C. Each product must go through two processing machines:
X and Y. The products require the following times in machines X and Y:
I. One ton of A requires 2 hours in machine X and 2 hours in machine Y.
2. One ton of B requires 3 hours in machine X and 2 hours in machine Y.
3. One ton of C requires 4 hours in machine X and 3 hours in machine Y.
