SeeSaw Toys reported that it had a book value of equity of $1.5 billion at the end of 1998 and 100 million shares outstanding. During 1999, it bought back 10 million shares at a market price of $40 per share. The firm also reported a net income of $150 million for 1999, and paid dividends of $50 million. a. Estimate the book value of equity at the end of 1999 b. Estimate the return on equity, using beginning book value of equity. c. Estimate the return on equity, using the average book value of equity.