Several years ago, a parent company acquired all of the outstanding common stock of its subsidiary for a purchase price of $400,000. On the acquisition date, this purchase price was $100,000 more than the subsidiary's book value of Stockholders' Equity. The AAP was entirely attributable to Goodwill. Since the date of acquisition, the subsidiary has reported cumulative net income of $400,000 and paid $50,000 of dividends to its parent company. Compute the balance of the Equity Investment account on the parent's pre-consolidation balance sheet assuming that the Goodwill asset has not declined in value subsequent to the date of acquisition.