Roberson Corporation was organized on January 1, 2020, with authorized capital of 750,000 shares of $10 par value common stock During 2020, Roberson issued 50,000 shares at $12 per share, purchased 3,000 shares of treasury stock at $13 per share, and sold 3,000 shares of treasury stock at $14 per share. What is the amount of Additional paid-in capital on December 31, 2020