Can someone help me work out the following ratios please? A) rate of return on total assets ; b) profit margin ; c) gross profit margin ; d) asset turnover ratio. The following information is available.

2010. 2009
Net sales (all on cre). 96000. 93000
Cost of sales 51300. 52500
Other expenses 6500. 6000
Cash at bank 2700. 3500
Acc rec net. 10700. 12500
Inventory 25000. 30000
Prepaid expenses 1000. 900
Tot non-current assets 50000. 67000
Tot current liabilities 39000. 49500
Tot non current liabilities 15000 25000
Capital 35400 39400

Thanks in advance

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