15.4 Casa Comfort is a leading retailer in the home improvement industry. Certain data from its financial statements for the years ended 31 March 2004 and 31 March 2005 follow (euro in millions):

2005 2004 Sales 38,434 30,219 EBIT 3,795 2,661 EAT 2,320 1,614 PPE, net 10,227 8,160 TA 17,081 13,465 Equity 12,341 8,740

(a) Compute ROTA for the years ended 31 March 2004 and 31 March 2005.

(b) Compute the margin on sales and total asset turnover. Show how these two ratios determine the ROTA.