A firm has a retention ratio of 36 percent and a sustainable growth rate of 10.90 percent. The capital intensity ratio is 1.34 and the debt-equity ratio is .71. What is the profit margin?

Please show all work so I understand, review will not be given if work is not shown.

a. 22.73 percent

b. 15.97 percent

c. 27.30 percent

e. 21.39 percent

f. 20.37 percent