Rearden Corporation is expected to have free cash flow in the coming year of 15 million, and this free cash flow is expected to grow at a rate of 4% per year thereafter. The company maintains a capital structure that consists of 25% debt and 75% equity. It has an equity cost of capital of 12%, a debt cost of capital of 5%, and it faces a 20% corporate tax rate. Required: Calculate the value of its interest tax shield