A paper mill produces two grades of paper viz., X and Y. Because of raw
material restrictions, it cannot produce more than 400 tons of grade X paper
and 300 tons of grade Y paper in a week. There are 160 production hours in a
week. It requires 0.20 and 0.40 hours to produce a ton of grade X and Y papers.
The mill earns a profit of Rs. 200 and Rs. 500 per ton of grade X and Y paper
respectively. Formulate this as a Linear Programming Problem..