
Answer:gain on retirement before income taxes=$50,000
Explanation:
Account and Particulars
Carrying value of bond = Â Â Â Â Â $4,000,000
Subtract:
Unamortized bond discount     $40,000
bond issue costs             $30,000
Overall net amount   $4,000,000 -(  $40,000+$30,000)  = $3,930,000
But
The paid amount at retirement = $4,000,000 x 97%= $3,880,000
Therefore gain on retirement before income taxes =$3,930,000- $3,880,000 = $50,000