This document discusses the cost of capital and how it is calculated. It defines cost of capital as the weighted average rate of return that a company must earn on its existing assets in order to maintain its market value. It explains that a company raises capital from various sources like equity shares, retained earnings, debentures and preference shares, with each source having a different cost associated with it. The weighted average of the costs of each source determines the overall cost of capital for the company. The document then discusses how to calculate the cost of various capital sources like debt, retained earnings, equity shares and preference shares. It also explains the importance of accurately determining the cost of capital for financial decision making.