In early 2015, Ford Motor (F) had a book value of equity of $25.2 billion, 4.1 billion shares outstanding, and a market price of $16.18 per share. Ford also had cash of $21.4 billion, and total debt of $118.9 billion. Three years later, in early 2018, Ford had a book value of equity of $34.6 billion, 10.8 billion shares outstanding with a market price of $10.13 per share, cash of $26.4 billion, and total debt of $157.8 billion. Over this period, what was the change in Ford's a. book debt-equity ratio? b. market debt-equity ratio? a. From 2015 until 2018, what was Ford's change in book debt-equity ratio? The change in Ford's book debt-equity ratio was 1. (Round to two decimal places.) b. From 2015 until 2018, what was Ford's change in market debt-equity ratio? The change in Ford's market debt-equity ratio was (Round to two decimal places.)