Use the Hamada equation to calculate the unlevered beta for JAB Industries, assuming the following data: Levered beta = b = 1.4; T= 40%; wd = 45%? (0.939%)

Suppose rRF= 6% and RPm= 5%. What would be the cost of equity for JAB Industries if it had no debt? (10.7%)

If wd were 45%? (13.0%)

The book gives the 10.7% and 13.0% answers, but I do not see how they came to those answers. Could you explain in detail how they found those answers?