Multiple choice general knowledge math & puzzles

S.I on a sum will be 6000 after 10 years.If principal triples after 5 years,what will be the total interest at the end of tenth year:

  1. 6000

  2. 9000

  3. 12000

  4. 120
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

If SI = 6000 after 10 years and principal triples in 5 years, then in 5 years the interest equals 2×principal (since tripling means gain of 2P). So rate = (2P/P)×(100/5) = 40%. Then SI after 10 years = (P × 40 × 10)/100 = 4P. Working backwards: if 4P = 12000, then original SI of 6000 means this checks out.

Keep practicing — related questions