Royce Corp's sales last year were $305,000, and its net income was $21,000. What was its profit margin? Oa. 3.44% Ob. 6.89% Oc. 5.16% Od. 6.44% Oe. 9.18%

Royce Corp's sales last year were $305,000, and its net income was $21,000. What was its profit margin? a. 3.44% b. 6.89% c. 5.16% d. 6.44% e. 9.18%