On 1 January 20X0, Zed Ltd Acquired 90 % of the Share

On 1 January 20X0, Zed Ltd acquired 90 % of the share capital of Ned Ltd for $900 000 cash.At that date, the equity section of Ned Ltd's balance sheet was as follows:
$$\begin{array} { | c | r | } \hline & { \$ } \\\hline \text { Share capital } & 700000 \\\hline \text { Retained profits } & 50000 \\\hline \text { Asset revaluation reserve } & 100000 \\\hline\end{array}$$
Assume all assets and liabilities were recorded at their fair values, except for a piece of equipment recorded at $50 000 but Zed Ltd considers it to have a fair value of $100 000.This equipment is not revalued by Ned Ltd.The fair value of NCI under the full method was estimated as being $100 000.What was the difference on acquisition?

A) Nil
B) $100 000 goodwill
C) $90 000 goodwill
D) $50 000 goodwill