Question

The U.S. Postal Service handles seven basic types of letters and cards: third class, second class, first class, air mail, special delivery, registered and certified. The mail volume during 1977 is given in the table below. What was the average revenue per ounce for these services during the year?

Type of Mailing	Ounces Delivered (in millions)	Price per Ounce
Third class	16,400	$0.05
Second class	24,100	0.08
First class	77,600	0.13
Air Mail	1,900	0.17
Special delivery	1,300	0.35
Registered	750	0.40
Certified	800	0.45

Answer 1