Accounting questions

For the attached document I need the following:

Calculate the following ratios for year ending August 31, 2012. You must show all working:

Current Ratio

Average Collection Period (Patient receivables only)

Days Cash on Hand, Short-Term Sources (Use Investments for Marketable Securities)

Average Payment Period

Operating Margin

Excess Margin

Return on Net Assets

Total Asset Turnover (Use Total Nonoperating Income for other Income)

Fixed Asset Turnover (Use Total Nonoperating Income for Other Income) (Use Property & Equipment for Net Fixed Assets)

Inventory Turnover

Net Asset Financing

Long-Term Debt to Capitalization (use long-term portion only)

Debt Service Coverage Ratio

Cash Flow to Debt

You must show all working!