Answer and Explanation:
The journal entry is shown below:
But before the following calculations are required
The Unamortized cost of the Issue is
= ($4,000 ÷ 10 years) × 7 years
= $2,800
Now
Discount on Bond is
= $820,000 - $780,000
= $40,000
And,
Unamortized Discount is
= ($40,000 ÷ 10 Years) × 7years
= $28,000
Now
Carrying Value of Bond after 3 Years is
= $820,000 - ($28,000 + $2,800)
= $789,200
And,
Loss on Early Retirement of Bond is
= $810,000 Â $-789,200
= $20,800
Now
Journal Entry is
Bond Payable  $820,000  Dr.
Loss on Early Retirement of Bond  $20,800
   To Discount on Bond Payable  $28,000
   To Cost of Issue of Bond Payable  $2,800 Â
   To Cash or Bank  $810,000
(being the call on bond is recorded)