accountants out there?!? I'm supposed to be writing a memo. Here are the instructions:

Choose at least three ratios that measure the debt-paying ability of your company. Explain why you chose these ratios. Calculate the ratios you chose and compare with the same ratios for a prior period or with the same ratios for another company. Comment on your company’s performance in the area of debt-paying ability. Identify any trends or unusual items.


The company I'm using is Yum! Brand and I'm comparing it to Nestle. I have so many questions:

What ratios should I use?
How do I calculate the ratios?
Where do I find the numbers to plug into the ratios?


I'm 100% lost! :-(
Links would help a lot. So would examples! Thank you!!