Selected MCQ

Current Question
A sum becomes triple in 3 years at compound interest. In how many years will it become 9 times?
  • A. 18
  • B. 12
  • C. 9
  • D. 6
Correct Answer: D
Explanation:
Growth is exponential → 6 years.
Related Question 1
A sum doubles itself in 5 years at compound interest. In how many years will it become eight times?
  • A. 7 years
  • B. 10 years
  • C. 15 years
  • D. 20 years
Correct Answer: C
Explanation:
8 = 2³ ⇒ 3 × 5 = 15 years.
Related Question 2
A sum becomes Rs. 1210 in 2 years at 10% per annum compound interest. What is the principal?
  • A. Rs. 1000
  • B. Rs. 1100
  • C. Rs. 1200
  • D. Rs. 900
Correct Answer: A
Explanation:
1000 × (1.1)² = 1210.
Related Question 3
A sum is put at simple interest for 2 years. If compounded annually, it becomes Rs. 750. What is the original sum?
  • A. Rs. 750
  • B. Rs. 700
  • C. Rs. 940
  • D. Rs. 820
Correct Answer: A
Explanation:
Equal amounts indicate no compounding effect.
Related Question 4
A sum at compound interest becomes Rs. 800 in 3 years and Rs. 840 in 4 years. Find rate.
  • A. 2.5%
  • B. 4%
  • C. 5%
  • D. 6⅔%
Correct Answer: C
Explanation:
Annual growth rate derived.
Related Question 5
A sum at compound interest becomes Rs. 2420 in 2 years and Rs. 2662 in 3 years. Find rate.
  • A. 15%
  • B. 10%
  • C. 7.5%
  • D. 8%
Correct Answer: B
Explanation:
The ratio of amounts gives the rate.