Q. As per the census 2011, India’s population was 1.21 billon, Which is ________ percent

Answer of this question "As per the census 2011, India’s population was 1.21 billon, Which is ________ percent", here are 4 choices for this question : 18.5 PERC, 17.5 PERC, 16.5 PERC, 15.5 PERC.
Answer Is "17.5 PERC".