The Old-Age Dependency Ratio (OADR) Is Calculated as __________

The old-age dependency ratio (OADR) is calculated as __________.

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