What is the weighted average cost of capital for a firm with a debt-to-equity ratio of 0.6 and a before-tax cost of debt of 8%, an after-tax cost of equity of 12%, and a corporate tax rate of 30%?

How do you calculate the future value of an investment that pays interest annually with a 6% interest rate for 5 years, assuming the investment is made today?

How do you calculate the net present value of a project that requires an initial investment of $50,000, generates annual cash inflows of $12,000 for 6 years, and has a required rate of return of 10%?

What is the operating profit margin for a company that had total revenue of $500,000, cost of goods sold of $300,000, and operating expenses of $100,000?
 
How do you calculate the interest coverage ratio for a company with earnings before interest and taxes of $500,000, interest expense of $100,000, and depreciation expense of $50,000?
 
How do you calculate the expected return and standard deviation of a portfolio consisting of two stocks with expected returns of 10% and 15%, respectively, and standard deviations of 20% and 25%, respectively?