Complete problem: Premium for Financial Risk XYZ, Inc. has an unlevered beta of 1.0. They are financed with 50% debt and has a levered beta of 1.6. If the risk-free rate is 5.5% and the market risk premium is 6%, how much is the additional premium that XYZ, Inc. shareholders require to be compensated for financial risk?

I am having trouble with the formulas needed for this question. If we are to use unlevered/levered formulas. What number is the tax rate? What is the equity, and I know they said the debt is 50% but since this is all percentages and not $ this is throwing me off.