Google financials, part 2. Google Inc. divides their total costs and expenses into five categories: cost of revenues, re- search and development, sales and marketing, general administrative, and miscellaneous. See the table at the bottom of the page.
a) What percent of all costs and expenses were cost of rev- enues in 2005? In 2006?
b) What percent of all costs and expenses were due to re- search and development in 2005? In 2006?
c) Have general administrative costs grown as a percentage of all costs and expenses over this time period?