At the end of $2024,$ a change in business climate indicated to management that the assets of Ellison might be impaired. The following

amounts have been determined:Undiscounted sum of future cash flows $$81$ millionPatent:Fair value $13$ million

Goodwill:Book value of Ellison's net assets $($excluding goodwill$)400$ million

$*$After first recording any impairment losses on plant and equipment and the patent.

Required:

Compute the book value of the plant and equipment and patent at the end of $2024.$

When should the plant and equipment and the patent be tested for impairment?

When should goodwill be tested for impalrment?

Determine the amount of any impairment loss to be recorded, if any, for the three assets.