Mark Jones' nuthouse is creating a new item, a blend of mixed nuts. The item must be at most 50 percent peanuts, must have more almond than cashews, and must be at least 10 percent pecans. The blend will be solved in one pound bags. Mark's goal is to mix the nuts in such a manner that all conditions are satisfied and the cost per bag is minimized. Peanuts cost $1 per pound, cashews $3 per pound, almond $5 per pound and pecans cost $6 per pound. Indentify the decision variables of this problem. Write out the objective and set of constraints for the problem.