Crash Co acquired70%of Bang Co's 100,000 $1 ordinary shares for $800,000 when the retained earnings of Bang Co were $570,000 and the balance in its revaluation surplus was $150,000. Bang Co also has an internally developed customer list which has been independently valued at $90,000. The non-controlling interest in Bang Co was judged to have a fair value of $220,000 at the date of acquisition.What was the goodwill arising on acquisition?