Two questions are stumping me: Can someone help please?

29. Constant -Growth DCF formula -The constant-growth DCF formula

DIV1

P0 =r-g

is sometimes written as

ROE(1-b)BVPS

P0=r-bROE

where BVPS is book equity value per share, b is the plowback ratio, and ROE is the ratio of earnings per share to BVPS. Use this equation to show how the price-to-book ratio varies as ROE changes. What is price-to-book when ROE =R

30. DCF Valuation - Portfolio managers are frequently paid a proportion of the funds under management. Suppose you manage a $100 million equity portfolio offering a dividend yield of(DIV1/P0)5%. Dividends and portfolio value are expected to grow at a constant rate. Your annual fee for managing this portfolio is .5% of portfolio value and is calculated at the end of each year. Assuming that you will continue to manage the portfolio from now to eternity, what is the present value of the management contract? How would the contract value change if you invested in stocks with a 4% yield?