Given: People opted product A = 20% People opted product B = 60% People who is uncertain = 100% – (20% + 60%) = 20% Calculation: Let the number of people covered in the survey be x People opted product B = 60% of x People who is uncertain = 20% of x Now, A/Q 60% of x – 20% of x = 720 ⇒ 40% of x = 720 ⇒ x =
(720×100)
40
⇒ x = 1800 ∴ The total number of people covered in the survey is 1800