I am a little lost, please help.

Loreto Inc. has the following financial ratios: asset turnover = 1.80; net profit margin (i.e., net income/sales) = 4%;payout ratio = 20%; equity/assets = 0.50. a. What is Loreto's sustainable growth rate? b. What is its internal growth rate? (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places.) a. Sustainable growth rate b. Internal growth rate : %