In early 2015, Ford Motor (F) had a book value of equity of $25.1 billion, 3.6 billion shares outstanding, and a market price of $16.01 per share. Ford also had cash of $21.2 billion, and total debt of $118.1 billion. Three years later, in early 2018 , Ford had a book value of equity of $35.5 billion, 4.9 billion shares outstanding with a market price of $10.04 per share, cash of $26.8 billion, and total debt of $156.9 billion. Over this period, what was the change in Ford's a. market capitalization? b. market-to-book ratio? c. enterprise value