prove the function is monotone on [0,2]

A firm wishes to issue new shares of its stock, which already trades in the market. The current stock price is $28, the most recent dividend was $3 per share, and the dividend is expected to grow at a rate of 4% forever. Flotation costs for this issue are expected to be 6%. What is the required rate of return (or financing cost) in this new issue? Note: when flotation costs are given as a percentage instead of in dollar terms, the denominator in the formula changes from (P-F) to P*(1-F). Enter your answer as a percentage, rounded to two decimals. So, if your answer is 0.123456, enter 12.34