goodwill impairment – Group reporting

Watts Co acquired 70% of the share capital of Pilkington Co on 1 January 20X2 for
$300,000.
The goodwill arising on consolidation has been impaired by $50,000 as at 31 December
20X5.
The share capital and reserves of the two companies as at 31 December 20X5 were as
follows:
Watts Co Pilkington Co
Share Capital $400,000 $150,000
Retained earnings $300,000 $200,000
At the date of acquisition Pilkington Co had retained earnings of $125,000. Watts Co
measures the non-controlling interest as the proportion of net assets of the subsidiary.
In the consolidated statement of financial position of at 31 December 20X5 what amount
should appear for the non-controlling interest?
A $105,000
B $90,000
C $82,500
D $60,000
My answer is coming $90000. Is it right?
Please help in this one