Answer and Explanation:
The computation is shown below:
1.
Particulars       Amount      PV factor at 6% for 10 years     Present value
Semi-annual interest $27,500 Â Â Â 7.360087 Â Â Â $202,402.39
                ($500,000 × 11% ÷ 2)
Principal          $500,000    0.558395    $279,197.50
Total                                     $481,599.89
2.
Particulars       Amount      PV factor at 5% for 10 years     Present value
Semi-annual interest $27,500 Â Â Â Â 7.721735 Â $212,347.71
                ($500,000 × 11% ÷ 2)
Principal          $500,000     0.613913  $306,956.5
Total                                     $519,304.21