Subsidiary Impairment (Partial Goodwill)

Hello, I'm looking at the question on page 21 of the notes, it all seems to make sense except for the figure of $7m which relates to the NCI share of impairment. From what I understand the figure should be $8m (0.2 x $40m). This would result in impairment to recognise to be $32m. Journal Entries: DR Group P/L $32m CR Goodwill $28m CR S's N.A $4m Am I correct? Please advise if I'm wrong! Thank you.