The answer is for reference only: (1) annual net cash flow of Scheme A and Scheme B: ① annual net cash flow depreciation of Scheme A = (100-5)/ 5 = 19 (ten thousand yuan) ncf0 =- 150 (ten thousand yuan) ncf0. 9 = 49 (ten thousand yuan)) ncf2 =-80 (ten thousand yuan) ncf3 ~ 6 = 170-80 = 90 (ten thousand yuan) ncf7 = 90+80+8 = 178 (ten thousand yuan) (2) calculation scheme a and scheme. 49 = 3.06 (year) ② Scheme B's static payback period without construction period = 200/90 = 2.22 (year) Scheme B's static payback period with construction period = 2+2.22 = 4.22 (year) (3) Calculate the net present value of Scheme A and Scheme B = 49× (P/A) 5)- ② NPV of Scheme B = 90× (ten thousand yuan 2)+178× (p2)-120 =141.00 (ten thousand yuan) (4) Calculate the annual equivalent net recovery of Scheme A and Scheme B, and compare the advantages and disadvantages of the two schemes. ① The annual equivalent net recovery of Scheme A = =69.90/(P/A (P/A, 10%, 5) = 18.44 (ten thousand yuan) ② The annual equivalent net recovery of Scheme B =141.00. The minimum common multiple of the calculation period of the two schemes is 35 years. ① The adjusted NPV of Scheme A = 69.90+69.90× (P/F, 10%, 5)+69.90× (P/F, 10%, 10%). 15)+69.90×(P/F， 10%，20)+69.90×(P/F， 10%，25)+69.90×(P/F， 10%， 30) = 177.83 (ten thousand yuan) ② The adjusted net present value of Scheme B =141.0014+1.00× (p/f) The shortest calculation period is 5 years, so: adjusted NPV of Scheme A = original NPV = 69.90 (ten thousand yuan); The adjusted net present value of Scheme B = the annual equivalent net recovery rate of Scheme B× (P/A, 10%, 5) = 109.78 (ten thousand yuan).