This is a Russian translation of the August 13, 2015 version of UVA-F-1710. This technical note provides a student primer of firm cost of capital from a conceptual and application perspective. The note provides student intuition on the traditional theory of cost of debt, cost of equity, and weighted-average cost of capital. Moreover, it provides detail on the common approaches to estimating the cost of capital. Specific examples are provided. The note is updated with market data from 2015.