Linear Programming Help!?

A packer makes a kind of wurst using beef, pork, cereal, fat, water, and spices. The minimum cereal content is 12%, the min. fat is 15%, the min water is 6.5 % and the spices are 0.5% the remaining ingredients are beef and pork. There must be at least 30% beef and 20@pork. The beef content must equal or exceed the pork content. The cost of all the content except beef and pork is 32.00 per 100 lbs Beef can be purchased for 140.00 per 100 lbs. and pork for 90.00 per 100 lbs. Find the combination of beef and pork for the minimum cost. What is the minimum cost per 100lbs?