Can you please assist with the Dividend payout and max sustainable growth rate?

High Flyer, Inc., wishes to maintain a growth rate of 12 percent per year and a debt-equity ratio of .25. The profit margin is 5 percent, and total asset turnover is constant at 1.20.

a.	What is the dividend payout ratio? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)
b.	What is the maximum sustainable growth rate for this company? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)