You’ve got an idea for a new product line, a way to revamp your inventory management system, or a piece of equipment that will make your work easier. But before you spend the company’s hard-earned money, you’ve got to prove to your company’s leaders that it’s worth the investment. You’ll likely be asked to show that the return on the investment will be better than your company’s cost of capital. But are you sure you know exactly what that is? And how your company uses it?