A firm's net income is exist260,000 on sales of exist31.5 million. Average assets for the period were exist7 million. For the year: a) Margin was 5%, turnover was 1.2, and ROI was 6%. b) Margin was 6%, turnover was 1.5, and ROI was 6%. c) Margin was 1%, turnover was 4.5, and ROI was 4.5%. d) Margin was 4%, turnover was 1.2 and ROI was 4.8%