Q. How long will it take for Rs. 2400 to amount to Rs. 3000 at 5% simple interest?
(A)
4 years
(B)
5 years
(C)
6 years
(D)
3 years
✅ Correct Answer: (B)
5 years
Explanation: SI = 3000 − 2400 = 600. T = SI×100/(P×R) = 600×100/(2400×5) = 5.
Q. At what rate will Rs. 1800 yield Rs. 324 as simple interest in 3 years?
(A)
4%
(B)
5%
(C)
6%
(D)
7%
✅ Correct Answer: (C)
6%
Explanation: R = 324×100/(1800×3) = 6%.
Q. A man receives Rs. 960 after 2 years on a sum lent at 8% simple interest. What is the principal?
(A)
Rs. 800
(B)
Rs. 900
(C)
Rs. 860
(D)
Rs. 880
✅ Correct Answer: (A)
Rs. 800
Explanation: Amount = P(1.16) ⟹ P = 960/1.16 = 800.
Q. Simple interest on Rs. 5000 for 1.5 years is Rs. 450. What is the annual rate?
(A)
4%
(B)
5%
(C)
6%
(D)
7%
✅ Correct Answer: (C)
6%
Explanation: R = 450×100/(5000×1.5) = 6%.
Q. At simple interest, which of the following remains constant every year?
(A)
Principal only
(B)
Interest only
(C)
Amount only
(D)
Principal and interest both
✅ Correct Answer: (B)
Interest only
Explanation: In SI, interest accrued each year is constant.
Q. The rate of interest is 8% per annum. What will be the simple interest in 6 months on Rs. 3000?
(A)
Rs. 100
(B)
Rs. 120
(C)
Rs. 140
(D)
Rs. 160
✅ Correct Answer: (B)
Rs. 120
Explanation: Time = 0.5 years. SI = 3000×8×0.5/100 = 120.
Q. A person deposits Rs. 9000 in a bank at 7% SI for 2 years. What will be the amount?
(A)
Rs. 9960
(B)
Rs. 10260
(C)
Rs. 11000
(D)
Rs. 12000
✅ Correct Answer: (B)
Rs. 10260
Explanation: SI = 9000×7×2/100 = 1260. Amount = 9000 + 1260 = 10260.
Q. A sum becomes Rs. 4200 in 3 years at 5% simple interest. What is the principal?
(A)
Rs. 3500
(B)
Rs. 3600
(C)
Rs. 3800
(D)
Rs. 4000
✅ Correct Answer: (D)
Rs. 4000
Explanation: A = P(1.15) ⟹ P = 4200/1.15 = 4000.
Q. Simple interest on a sum is Rs. 800 in 2 years at 10% per year. What is the principal?
(A)
Rs. 3600
(B)
Rs. 3800
(C)
Rs. 4000
(D)
Rs. 4200
✅ Correct Answer: (C)
Rs. 4000
Explanation: P = 800×100/(10×2) = 4000.
Q. Amount received after 4 years is Rs. 5040 at 8% simple interest. Find the principal.
(A)
Rs. 4000
(B)
Rs. 4200
(C)
Rs. 4500
(D)
Rs. 4800
✅ Correct Answer: (B)
Rs. 4200
Explanation: Amount = P(1.32) ⟹ P = 5040/1.32 = 4200.
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