In $2020,$ Caterpillar Incorporated had about $540$ million shares outstanding. Their book value was $$45\mathrm{.}4$ per share, and the market price was $$93\mathrm{.}70$ per share. The company$$s balance sheet shows that the company had $$29\mathrm{.}70$ billion of long$-$term debt, which was currently selling near par value.

A$.$ What was Caterpillar$$s book debt$-$to$-$value ratio?

Note: Do not round intermediate calculations. Enter your answer as a decimal rounded to $2$ decimal places.

B$.$ What was its market debt$-$to$-$value ratio?

Note: Do not round intermediate calculations. Enter your answer as a decimal rounded to $2$ decimal places.

C$.$ Which measure should you use to calculate the company$$s cost of capital?