help with nci in multiple choice questions

1. when a company acquired an 80% of the 50000 $1 equity shares of another company for $80000 cash, the fair valued net assets of the new subsidiary were valued at $85000. the investing company had in issue $ 300000 equity shares of 50 cents each. subsequent to acquisition, the subsidiary has achieved $55000 retained earnings and the parents retained earning at the date of year statements of financial position was $102000. there have been no shares issued by either companies since acquisition. what figure will appear in the consolidated financial statements under the heading non controlling interest, Alternative 4 alternative 3 alternative 1 alternative 2 *** no list list of alternatives workings have been given. Please need help to understand how they arrive at the answer.