What Costs the Most, Labor to Make a Car or Wheat to Make Bread

According to this: "First, labor only accounts for only about 7 percent of the cost of a car." Interview with Steven Rattner quoted at Ezra Klein.

That surprising fact reminds me of a similar observation:: "A $2.59 loaf of white bread contains 14 cents worth of wheat."  That won't prevent bakers from raising prices based on higher wheat prices.