πŸ“Š Math
Q. A certain sum becomes β‚Ή8100 in 3 years at 12% simple interest. What is the principal?
  • (A) β‚Ή7000
  • (B) β‚Ή7200
  • (C) β‚Ή7500
  • (D) β‚Ή7600
πŸ’¬ Discuss
βœ… Correct Answer: (B) β‚Ή7200

Explanation: Amount = P(1 + RT/100) → 8100 = P(1 + 0.36) → P = 8100 / 1.36 = 7200.

πŸ“Š Math
Q. Rate = 9% p.a, Time = 6 years, SI = β‚Ή9720. Find the principal.
  • (A) β‚Ή16000
  • (B) β‚Ή17000
  • (C) β‚Ή18000
  • (D) β‚Ή20000
πŸ’¬ Discuss
βœ… Correct Answer: (C) β‚Ή18000

Explanation: SI = (P × 9 × 6) / 100 → P = (9720 × 100) / 54 = 18000.

πŸ“Š Math
Q. The simple interest on a sum for 5 years at 4% per annum is β‚Ή1000. What is the principal?
  • (A) β‚Ή4500
  • (B) β‚Ή5000
  • (C) β‚Ή5300
  • (D) β‚Ή6000
πŸ’¬ Discuss
βœ… Correct Answer: (B) β‚Ή5000

Explanation: SI = (P × 4 × 5) / 100 → 1000 = 20P/100 → P = 5000.

πŸ“Š Math
Q. At what rate will a sum double itself in 12.5 years at simple interest?
  • (A) 6%
  • (B) 7%
  • (C) 8%
  • (D) 9%
πŸ’¬ Discuss
βœ… Correct Answer: (C) 8%

Explanation: To double → 100% interest → 100 / 12.5 = 8%.

πŸ“Š Math
Q. If a sum of money triples in 20 years at simple interest, what is the rate?
  • (A) 5%
  • (B) 7.5%
  • (C) 10%
  • (D) 12%
πŸ’¬ Discuss
βœ… Correct Answer: (C) 10%

Explanation: To triple → gain 200% → rate = 200 / 20 = 10%.

πŸ“Š Math
Q. A person deposited β‚Ή5000 and received β‚Ή800 as interest. If the rate was 8%, find the time.
  • (A) 2 years
  • (B) 3 years
  • (C) 4 years
  • (D) 5 years
πŸ’¬ Discuss
βœ… Correct Answer: (A) 2 years

Explanation: SI = (5000 × 8 × T) / 100 = 800 → T = 2.

πŸ“Š Math
Q. What is the interest obtained when β‚Ή12000 is invested at 6.5% p.a for 2 years?
  • (A) β‚Ή1400
  • (B) β‚Ή1500
  • (C) β‚Ή1560
  • (D) β‚Ή1600
πŸ’¬ Discuss
βœ… Correct Answer: (C) β‚Ή1560

Explanation: SI = (12000 × 6.5 × 2) / 100 = 1560.

πŸ“Š Math
Q. If the time period is reduced to half, the simple interest becomes?
  • (A) Half
  • (B) Double
  • (C) Triple
  • (D) Same
πŸ’¬ Discuss
βœ… Correct Answer: (A) Half

Explanation: SI is directly proportional to time.

πŸ“Š Math
Q. β‚Ή6500 becomes β‚Ή7590 in 3 years. What is the rate?
  • (A) 5%
  • (B) 6%
  • (C) 7%
  • (D) 8%
πŸ’¬ Discuss
βœ… Correct Answer: (B) 6%

Explanation: SI = 7590 - 6500 = 1090 → R = (1090 × 100) / (6500 × 3) = 6%.

πŸ“Š Math
Q. What amount will β‚Ή4000 become in 2 years if the rate is 9% p.a?
  • (A) β‚Ή4720
  • (B) β‚Ή4780
  • (C) β‚Ή4800
  • (D) β‚Ή4860
πŸ’¬ Discuss
βœ… Correct Answer: (A) β‚Ή4720

Explanation: SI = (4000 × 9 × 2) / 100 = 720 → Amount = 4000 + 720 = 4720.

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