20 Powerful SSC CGL Interest MCQs with Solutions

20 Powerful SSC CGL Interest MCQs with Solutions

Practice SSC CGL Interest MCQs with detailed solutions, shortcut tricks, and Tier-II-level questions on Simple Interest and Compound Interest. Improve speed and accuracy for SSC CGL 2026.

1. A sum amounts to ₹6,600 in 2 years at 10% per annum Simple Interest. What is the principal?

A. ₹5,000  B. ₹5,500

C. ₹6,000  D. ₹4,800

Correct Answer: B. ₹5,500

Explanation:

Amount = Principal + SI

SI = P × 10 × 2 /100 = 0.2P

Amount = 1.2P

1.2P = 6600

P = 6600/1.2 = ₹5,500?

Wait:

Actually, SI = P×10×2/100 = 20% of P

If P=5500

SI=1100

Amount=6600

Hence Principal = ₹5,500

2. The Simple Interest on ₹8,000 at 12% per annum for 5 years is

A. ₹4,600  B. ₹4,800

C. ₹5,000  D. ₹5,200

Correct Answer: B. ₹4,800

Explanation:

SI=(8000×12×5)/100

      =₹4,800

3. At what rate will ₹2,500 earn ₹750 as Simple Interest in 6 years?

A. 4%  B. 5%

C. 6%  D. 7%

Correct Answer: B. 5%

Explanation:

R = (SI×100)/(P×T)

    = (750×100)/(2500×6)

     = 5%

4. A sum becomes ₹15,000 in 4 years at 25% Simple Interest. Find the principal.

A. ₹7,500  B. ₹8,000

C. ₹9,000  D. ₹10,000**

Correct Answer: A. ₹7,500

Explanation:

Interest = 25×4=100%

Amount = 200% of Principal

Principal = 15000÷2

                   = ₹7,500

5. Simple Interest on a certain sum for 8 years is equal to the principal. Find the rate.

A.10%  B.11%

C.12.5%  D.15%

Correct Answer: C. 12.5%

Explanation:

SI=P

P×R×8/100 = P

R=100/8

=12.5%

SSC CGL Interest MCQs

6. The Compound Interest on ₹10,000 at 10% per annum for 2 years is

A. ₹2,000  B. ₹2,100

C. ₹2,200  D. ₹2,300

Correct Answer: B. ₹2,100

Explanation

Amount =10000×1.1²

                =12100

CI=12100−10000

     =₹2,100

7. A sum becomes ₹9,680 in 2 years at 10% Compound Interest. Find the principal.

A. ₹7,800  B. ₹8,000

C. ₹8,200  D. ₹8,400

Correct Answer: B. ₹8,000

Explanation

P = 9680/1.21

    =₹8,000

8. The difference between Compound Interest and Simple Interest on ₹5,000 for 2 years at 20% per annum is

A. ₹100  B. ₹150

C. ₹200  D. ₹250

Correct Answer: C. ₹200

Explanation:

Difference =P(R²)/10000

                    =5000×400/10000

                    =₹200

9. A sum doubles itself in 10 years at Simple Interest. In how many years will it become three times?

A.15  B.18

C.20  D.25

Correct Answer: C. 20

Explanation:

Doubling means

Interest=100% in 10 years

Rate=10%

For triple amount,

Interest=200%

Time=20 years

SSC CGL Interest MCQs

10. The Compound Interest on ₹20,000 at 5% per annum for 3 years is

A. ₹3,050  B. ₹3,100

C. ₹3,152.50  D. ₹3,250

Correct Answer: C. ₹3,152.50

Explanation:

Amount =20000×1.05³

                 =20000×1.157625

                 =23152.50

CI =23152.50−20000

      =₹3,152.50

11. A sum of money amounts to ₹13,200 in 3 years at 10% per annum Compound Interest (compounded annually). Find the principal.

A. ₹9,000  B. ₹9,500

C. ₹10,000  D. ₹10,500

Correct Answer: C. ₹10,000

Explanation:

Amount = P(1 + R/100)³

13200 = P × (1.1)³

13200 = P × 1.331

P = 13200 ÷ 1.331

     = ₹10,000

12. The Simple Interest on a sum for 4 years at 15% per annum is ₹2,400. Find the principal.

A. ₹3,500  B. ₹4,000

C. ₹4,500  D. ₹5,000

Correct Answer: B. ₹4,000

Explanation:

SI = (P × R × T)/100

2400 = P ×15×4/100

2400 = 0.6P

P = ₹4,000

Shortcut Trick

15% ×4 = 60%

Principal = SI ÷60%

= 2400÷0.6

= 4000

13. At what annual rate will ₹8,000 become ₹10,400 in 3 years at Simple Interest?

A. 8%  B. 9%

C. 10%  D. 12%

Correct Answer: C. 10%

Explanation:

SI =10400−8000

     =2400

Rate  = (2400×100)/(8000×3)

         =10%

14. A sum invested at 8% Compound Interest becomes ₹11,664 in 2 years. Find the principal.

A. ₹9,800  B. ₹10,000

C. ₹10,200  D. ₹10,500

Correct Answer: B. ₹10,000

Explanation:

Amount=P×1.08²

                =1.1664P

P=11664÷1.1664

    =₹10,000

15. Find the difference between Compound Interest and Simple Interest on ₹12,000 for 2 years at 15% per annum.

A. ₹250  B. ₹260

C. ₹270  D. ₹280

Correct Answer: C. ₹270

Explanation:

Difference =P × R²/10000

                     =12000 × 225/10000

                      = ₹270

16. A sum becomes ₹18,000 in 5 years at 20% Simple Interest. Find the interest earned.

A. ₹8,000  B. ₹9,000

C. ₹10,000  D. ₹11,000

Correct Answer: B. ₹9,000

Explanation:

20% ×5 =100%

Interest = Principal

Amount =2P

Principal =18000÷2

=9000

Interest =₹9000

Shortcut Trick

100% interest ⇒ Amount doubles.

17. A person borrows ₹25,000 at 12% per annum Simple Interest for 18 months. Find the interest.

A. ₹4,000  B. ₹4,200

C. ₹4,500  D. ₹4,800

Correct Answer: C. ₹4,500

Explanation:

18 months =1.5 years

SI=(25000×12×1.5)/100

    =₹4,500

18. If the Compound Interest on a sum for 2 years at 10% is ₹2,310, find the principal.

A. ₹9,000  B. ₹10,000

C. ₹11,000  D. ₹12,000

Correct Answer: C. ₹11,000

Explanation:

For 2 years at 10%

CI =21% of Principal

Principal=2310÷0.21

                 =₹11,000

19. A sum invested at 10% Compound Interest becomes ₹14,641 in 4 years. Find the principal.

A. ₹9,500  B. ₹10,000

C. ₹10,500  D. ₹11,000

Correct Answer: B. ₹10,000

Explanation:

(1.1)⁴=1.4641

Principal =14641÷1.4641

                  =₹10,000

SSC CGL Interest MCQs

20. The Simple Interest on a sum for 6 years at 8% per annum is ₹3,840. Find the amount.

A. ₹10,000  B. ₹11,840

C. ₹12,000  D. ₹12,800

Correct Answer: B. ₹11,840

Explanation

SI=(P×8×6)/100

3840=0.48P

P=3840÷0.48

  =₹8,000

Amount =8000+3840

                =₹11,840

SSC CGL Quantitative Aptitude Topics

• Number System
• Decimals
• Fractions
• Percentages
• Ratio & proportion
• Square roots
• Averages
• Interest (simple & compound)
• Profit & loss
• Discount
• Partnerships
• Mixture & alligation
• Time & speed & distance
• Time & work.
• Advanced math includes basic algebraic identities
• Elementary surds
• Graphs of linear equations
• Triangles
• Circles
• Regular polygons, right prisms, cones, cylinders, spheres
• Trigonometry.

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