Kit question Traveler 12/11

Hello Sir, I came across this question today in which the parent had acquired two subsidiaries. For subsidiary A we’ve to calculate goodwill using the full goodwill method and for subsidiary B using the partial goodwill. The year end is 30th November 2001, and subsidiary B was acquired, 80%, on 1st December 2001. I’ve correctly calculated the goodwill of both the subsidiaries along with the Impairment, which required grossing up of the goodwill for subsidiary B my question to you is that why the impairment of subsidiary B was not deducted in the calculation of NCI when the other 80% of the impairment was deducted in the calculation of Retained Earnings.

Thank you.