please solve with the ytm formula (last pic) also if the C rate is 940 what is the way to way to get that

Jiminy's Cricket Farm issued a bond with 30 years to maturity and a semiannual coupon rate of 5 percent 3 years ago. The bond currently sells for 94 percent of its face value. The company's tax rate is 22 percent. a. What is the pretax cost of debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What is the aftertax cost of debt? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Note: Intermediate answers are shown below as rounded, but the full answer was used to complete the calculation. a. The pretax cost of debt is the YTM of the company's bonds, 50 : P0=5940=525(PVIFAP%,54)+51,000(PVIFRF.54)R=2.713%YTM=22.713%=5.43% b. The aftertax cost of debt is RD=0543(r22)RD=.0423.or4.233 The dfiertox rete is more relevant because that is the actual cost to the company, YTM=[2FV+PV][C+(tFVPV)]