An individual wishes to invest $25000 in two types: Investment A yields 15%, and investment B yields 18%. Market research suggests an allocation of at least 35% in A and at most 45% in B. In addition, investment in A should be at least twice the investment in B. a) Show the decision variables Show the objective function Show and name the constraints in standard form (suitable for using Excel) Solve the problem by using Excel. Do so and write a conclusion of your findings for the b) c) person.