I need the answer to question 9.20 and only 9.20

Supplementary Problems 9.18 The executives of the XYZ Company are considering the three independent proposals whose cash flows are given in Table 9-12, The MARR is 10%. Evaluate these three proposals by the NPV method. Table 9-12 End of Year Proposal A Proposal B Proposal C -$50 000 16 461.50 16 461.50 16 461.50 16 461.50 - $80 000 28 021.60 28 021.60 28.021.60 28 021.60 -$150 000 45 000 45 000 45 000 45 000 Ans. NPVA = $2180.87, NPVB = $8824.93, NPVc=-$7355.69; proposal C is unacceptable. 9.19 Rework Problem 9.18 for MARR= 15%. Ans. NPVA= -$3003.40, NPVB=0, NPVc=-$21 527.68; proposals A and C are unacceptable and proposal B is barely acceptable. 9.20 Evaluate the three proposals in Problem 9.18 using the ROR method and linear interpolation Ans. i*= 12%, i = 15%, i* = 7.71%; since i*