Answer:
$669,018
Explanation:
The computation of the interest expense reported is shown below:
Date   Interest Payment  Interest    Amortization of  Balance  Book
    (Face Value ×      Expense [B]  Bond Discount           value
     Coupon Rate                (A-B)                    of
      × 1 ÷ 2) [A]                                Bonds
02-Jan-17 Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â $441,600 $5,558,400
30-Jun-17 $300,000 Â Â Â $333,504 Â Â Â $33,504 Â $408,096 Â Â Â $5,591,904
(6,000,000 ×10% ×1 ÷ 2) ($5,558,400 × 12%  ($441,600 - $33,504)
                        × 1 ÷ 2)          (5,558,400 + 33504)
31-Dec-17 $300,000 Â Â Â $335,514
($6,000,000 × 10% ×1 ÷ 2) ($5,591,904 × 12% ×1 ÷ 2)  Â
The total amount of interest expense is
= $333,504 + $335,514
= $669,018