The Old-Age Dependency Ratio (OADR)is Calculated as the Number of People

The old-age dependency ratio (OADR) is calculated as the number of people who are _____.

A) age 65 years or older,divided by the number of people age 20 to 64,times 100
B) age 20 to 64 years old,divided by the number of people age 65 or older,times 100
C) age 55 years or older,multiplied by the number of people age 18 or older,times 50
D) age 55 years or older,added to the number of people age 21 or older,times 50