Manual hand solution please

Four project A, B, C, D with limited budget (160000$), the sum of present worth is Z, the math programming formulation is, Max Z= KA 5230B + 87400 + 8040D Subject to: 50000A + 80000B + 90000C +100000D S 160000 A, B, C, D = 0 or 1. If the interest rate MARR is 12% and the life of project A and B is (5)year, project c (3)year and project Dis (4)year, and the present value for bundle AC is 38930$. For all project no salvage, only initial cost and annual cash flow. 1. Select the economically best projects using the present worth. 2. Find the internal rate of return for project D. Four project A, B, C, D with limited budget (160000$), the sum of present worth is Z, the math programming formulation is, Max Z= KA 5230B + 87400 + 8040D Subject to: 50000A + 80000B + 90000C +100000D S 160000 A, B, C, D = 0 or 1. If the interest rate MARR is 12% and the life of project A and B is (5)year, project c (3)year and project Dis (4)year, and the present value for bundle AC is 38930$. For all project no salvage, only initial cost and annual cash flow. 1. Select the economically best projects using the present worth. 2. Find the internal rate of return for project D