Suppose Caterpillar, Inc., has 653 million shares outstanding with a share price of $75.55, and $24.44 billion in debt. If in three years, Caterpillar has 696 million shares outstanding trading for $87.96 per share, how much debt will Caterpillar have if it maintains a constant debt-equity ratio?

The amount of debt required in three years will be ________ billion.(Round to two decimal places.)