Multiple choice

The population of a city after three years will be 21,600. If rate of increase of population per year be 20% then find the present population of the city.

  1. 12,500

  2. 16,500

  3. 14,500

  4. 10,500
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Let P be the present population. P * (1 + 0.20)^3 = 21600. P * (1.2)^3 = 21600. P * 1.728 = 21600. P = 21600 / 1.728 = 12500.

AI explanation

Using the formula for present population, which is Future Population / (1 + R/100)^n, we calculate the present population as 21600 / (1 + 0.20)^3. This evaluates to 21600 / 1.728, which equals 12500.

Keep practicing — related questions