Q. The SI on a sum of money for 4 years at 10% p.a is ₹2000. What is the principal?
(A)
₹4000
(B)
₹4500
(C)
₹5000
(D)
₹6000
✅ Correct Answer: (C)
₹5000
Explanation: SI = (P × 10 × 4) / 100 → 2000 = 40P / 100 → P = 2000×100 / 40 = 5000.
Q. If the principal is doubled, what happens to the simple interest?
(A)
It becomes half
(B)
It doubles
(C)
It triples
(D)
It stays constant
✅ Correct Answer: (B)
It doubles
Explanation: SI is directly proportional to principal.
Q. Find the time required for a sum to earn 60% of itself as simple interest at 12% p.a.
(A)
4 years
(B)
4.5 years
(C)
5 years
(D)
6 years
✅ Correct Answer: (C)
5 years
Explanation: 60% / 12% = 5 years.
Q. A sum of ₹9000 gives simple interest of ₹2430 in some time at 9% p.a. Find the time.
(A)
2.5 years
(B)
3 years
(C)
3.5 years
(D)
4 years
✅ Correct Answer: (B)
3 years
Explanation: SI = (9000 × 9 × T) / 100 → 2430 = 810T → T = 3.
Q. On what sum will the simple interest for 5 years at 11% p.a be ₹3300?
(A)
₹5000
(B)
₹5500
(C)
₹6000
(D)
₹7000
✅ Correct Answer: (C)
₹6000
Explanation: SI = (P × 11 × 5) / 100 → 3300 = 55P/100 → P = 3300×100 / 55 = 6000.
Q. What will be the simple interest on ₹4500 at 7% per annum for 3 years?
(A)
₹840
(B)
₹945
(C)
₹750
(D)
₹920
✅ Correct Answer: (B)
₹945
Explanation: SI = (4500 × 7 × 3) / 100 = 945.
Q. A man invests ₹8000 at 5% simple interest for 4 years. What amount will he receive at the end?
(A)
₹9200
(B)
₹9600
(C)
₹10000
(D)
₹10400
✅ Correct Answer: (B)
₹9600
Explanation: SI = (8000 × 5 × 4) / 100 = 1600 → Amount = 8000 + 1600 = 9600.
Q. What will be the rate of interest if ₹3000 becomes ₹3540 in 3 years?
(A)
4%
(B)
5%
(C)
6%
(D)
7%
✅ Correct Answer: (C)
6%
Explanation: SI = 3540 - 3000 = 540 → R = (540 × 100) / (3000 × 3) = 6%.
Q. How long will it take for ₹2500 to yield ₹750 as simple interest at 10% per annum?
(A)
2 years
(B)
3 years
(C)
4 years
(D)
5 years
✅ Correct Answer: (B)
3 years
Explanation: SI = (2500 × 10 × T) / 100 = 750 → T = 3.
Q. Principal = ₹9000, Rate = 8% p.a. Time = 2.5 years. Find the interest.
(A)
₹1500
(B)
₹1700
(C)
₹1800
(D)
₹2000
✅ Correct Answer: (C)
₹1800
Explanation: SI = (9000 × 8 × 2.5) / 100 = 1800.
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