If there are 22 million people below 36 years, then the number of people (in millions) in the age group (56 - 65) is:

Answer: Option A

Percentage of people below 36 years
= (20 + 18.25 + 16.75)%
= 55%
55% = 22 millions
$$\begin{array}{rl}& 1\%=\frac{22}{55}\\ & 12.5\%=\frac{22}{55}\times 12.5\\ & =5\text{ millions}\end{array}$$