please use excel to answers the 3 questions

A trust officer needs to determine how to invest $100,000 in the following collection of bonds to maximize return. Bond A B D E Annual Return 9.5% 8.0% 9.0% 9.0% 9.0% Maturity Long Short Long Long Short Risk High Low Low High High Tax Free Yes Yes No Yes No The officer wants to invest at least 50% of the money in short-term issue and no more than 50% in high-risk issues. At least 30% of the funds should go in tax-free investments and at least 40% of the total annual return should be tax free. a. Formulate an LP model for this problem. b. Create a spreadsheet model for this problem and solve it using Solver. c. What is the optimal solution