Facts

The calculation refers to an impairment loss suffered by subsidiary Zen at December 31, 20X4:

Goodwill

Net assets

Total

$m

$m

$m

December 31, 20X4—carrying value

300

900

1200

Impairment

(300)

(200)

(500)

700

700

There has been a favorable change in the estimates of the recoverable amount of Zen’s net assets since the impairment loss was recognized. The recoverable amount is now $800 million at December 31, 20X5. The net assets’ carrying value would have been $720 million at December 31, 20X5. Assets are depreciated at 20% reducing balance.

Required

Show the accounting treatment for the reversal of the impairment loss as of December 31, 20X5.