Compare Starbcuks beta results to the beta listed on Yahoo Finance

Look up the current risk-free rate (use one-year treasury rates) and any bond yield and tax rate data for Starbucks. If you cant find your firms bond yields look up their bond rating and try to find current bond yields for bonds with ratings at that level. If there is preferred stock outstanding, get that data as well.

Using the collected information Calculate the cost of equity, cost of debt and cost of preferred Starbucks.