solution

For the Beauty Grow Fertilizer production problem (problem 18), the following table represents the percentage of nitrogen, phosphorus, and potassium in each of the three compounds:

For the Beauty Grow Fertilizer production problem (problem 18), the following table represents the...-1

Beauty Green is to be labelled 25-5-5, while Beauty Turf is to be labelled 10-18-5. These values are the minimum percentages of nitrogen, phosphorus, and potassium, respectively that must be in each bag.

a. Write a model shell that states that the minimum percentage of nitrogen in Beauty Green is 25%. Do this by expressing the actual percentage of nitrogen as a weighted average of the percentage of nitrogen in each compound. It will take the following form: (Proportion of Compound 1 in Beauty Green) (N1) + (Proportion of Compound 2 in Beauty Green) (N2) + (Proportion of Compound 3 in Beauty Green) (N3) > 25

b. Write a model shell stating that the minimum percentage of nitrogen in Beauty Turf is 10%. Do this by expressing the actual percentage of nitrogen as a weighted average of the percentage of nitrogen in each compound. It will take the following form: (Proportion of Compound 1 in Beauty Turf) (N)) + (Proportion of Compound 2 in Beauty Turf) (N2) + (Proportion of Compound 3 in Beauty Turf) (N3) > 10

c. Constraints for the percentages of phosphorus and potassium in Beauty Green and Beauty Turf have the same form as those in (a) and (b). Develop a complete mathematical model for Beauty Grow Fertilizer using the following values of the parameters:

Selling price of a bag of Beauty Green: $4.00                                                                                                     Selling price of a bag of Beauty Turf: $3.50 Cost per pound of Compound 1: $0.15                                         Cost per pound of Compound 2: $0.12                                                                                                                      Cost per pound of Compound 3: $0.10                                                                                                                Demand (bags) of Beauty Green: 1000                                                                                                                   Demand (bags) of Beauty Turf: 800                                                                                                                   Availability (pounds) of Compound 1: 15,000                                                                                              Availability (pounds) of Compound 2: 20,000                                                                                                       Availability (pounds) of Compound 3: 30,000

For the Beauty Grow Fertilizer production problem (problem 18), the following table represents the...-2

 

 
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