A firm has EBIT of $15,800,000.00, total assets of $100,000,000.00, a tax rate of 40 percent, a cost of debt of 8.0 percent, and a debt/equity ratio of 1.00. As discussed in class, the ROE for a levered firm is also a function of a firm's return on assets (ROA) for an equivalent unlevered firm, plus a leverage effect, plus a tax shelter effect. Given the information above, determine what percentage of the firm's total return on equity arises from the tax shelter effect