Each serving of Gerber Mixed Cereal for Baby contains 60 calories and 10% of the USRDA of Vitamin C. Each serving of Gerber Mango Tropical Fruit Dessert contains 80 calories and 20% of the USRDA of Vitamin C. You want to provide your child with at least 140 calories, but less than 50% of the USRDA of Vitamin C. How many servings of each type of food should you give to your child? Write what the unknowns stand for, write the objective function, and write the constraints, but do not solve the linear programming problem.