William acquired 70% of the equity shares of Zeta on I April when Zeta's retained earnings were $200,000 on that date. During the year ended 31 March 20X5, William purchased goods from Zeta totalling $320,000. At 31 March 20X5, one quarter of these goods were still in the inventory of William. Zeta applies a margin of 25% to all of its sales. At 31 March 20X5, the retained eamings of Zeta were $340,000. What would be the amount Of group's share Of Zeta's post acquisition retained earnings as at 31 March 20x5