How do you prepare common size income statements?

To prepare a common size income statement, is to turn value into percentages with a common demonitor. Item/reference item. In an income statement the reference item is the sales, revenue... and it is always 100% because 1/1=100% Then go down through each item on income statement and turn into %. Ex: Cost of Goods sold: 120,000
sales: 1,000,000= 120,000/1,000,000=12% so cost of goods sold is 12% of sales. If you are comparing 2 years, do the same for each year, and put next to on income statement to show comparison.
2000 2001
sales 100% 100%
CGS 12% 15%
hope this helps;)