U.S. Cost to mail a letter- 5 cents. Loaf of bread- 21 cents. Gallon of Gasoline- 30 cents. Cheeseburger, Fries and Milkshake at McDonald's- 59 cents. Adult admission to Movie - $1.25. Average price for new car- $3,500. Average price for new home- $13,000. Average yearly salary: $6,000