Multiple choice general knowledge math & puzzles

A sum of money at simple interest amounts to Rs.2240 in two years and Rs.2600 in 5years. What is the sum?

  1. 1960

  2. 2000

  3. 2100

  4. 1800

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Interest for 3 years (5-2) = 2600-2240 = Rs.360. Annual interest = Rs.120. For 2 years, interest = Rs.240. Principal = 2240-240 = Rs.2000. Rate = 120/2000 = 6%. This uses the constant growth property of simple interest.