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Compound Interest for SSC MTS | Concepts & Practice | SSC MTS Quantitative Aptitude

Build Compound Interest accuracy for SSC MTS with concept clarity, key relations, exam-speed methods and approved practice.

Tailored for SSC MTS Quantitative Aptitude. 1 active practice questions. Related topics: Percentage, Profit and Loss, Simple Interest.

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Understand the fastest pattern for this topic before you attempt full MCQs.

Avoid common traps

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Solve faster in exam

Apply one practical method before attempting MCQs and cut down hesitation.

Summary Formula Tricks Mistakes Solved Example Practice FAQ

Compound Interest revision for SSC MTS: understand the base rule, apply the correct formula or relation, check common traps, then practise with approved questions.

Compound Interest is calculated on the updated amount after each compounding period, so the base changes over time. Treat growth as a multiplier rather than repeatedly calculating interest separately.

SSC MTS focus: Solve the core method first, then use the approved practice questions on this page to build exam-speed accuracy.

Compound Interest revision rule: concept → formula/relation → one worked example → timed practice → error review.

Core concept
Key formula/relation
Common trap
Approved practice

A = P(1+r/100)^n
CI = A-P
For depreciation: A=P(1-r/100)^n

For two years at the same rate, multiplying by the growth factor twice is usually faster and less error-prone.

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Read the exact requirement before choosing a shortcut.
Keep units, signs and percentage bases consistent.
Use the final few seconds to verify direction and magnitude.

Using a memorised shortcut without checking its condition.
Skipping unit or base conversion.
Doing long arithmetic before identifying the underlying relation.

Practice example: In a Compound Interest practice set, a student answers 18 questions correctly out of 24. What percentage is correct?

Solution: Correct percentage = 18/24 x 100 = 75%.

In a Compound Interest practice set, a student answers 18 questions correctly out of 24. What percentage is correct?

Learn the shortcut first

Shortcut before you solve

Compound Interest becomes straightforward once compounding frequency, rate and time are identified.

Faster solving steps

Use this 4-step method before solving to keep your thinking fast and repeatable.

Step 1 Identify relation

Spot the pattern, relationship, or core idea first.

Step 2 Apply same pattern

Use the same rule instead of re-solving from scratch.

Step 3 Eliminate wrong options

Remove confusing choices before comparing the last few.

Step 4 Confirm final answer

Pick the option that matches the shortcut most cleanly.

Practice Questions

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Now apply the trick on real questions

Use the shortcut above before solving these questions

Use A = P(1 + R/100)^T for annual compounding, then CI = A - P.

Tip: Compound interest is earned on principal plus previously accumulated interest.

Step 1

Amount = 1000 x (1.10)^2 = Rs. 1210.

Step 2

Compound interest = 1210 - 1000 = Rs. 210.

Rule

For annual compounding, A = P(1 + R/100)^T and CI = A - P.

3-second trick

For two years at rate r%, think year-by-year growth or square the growth factor.

Trap to avoid

Do not use PRT/100 when the question asks for compound interest.

Correct answer

Rs. 210

Thinking path

First-year amount becomes Rs. 1100.
Second-year interest is calculated on Rs. 1100.
Final amount is Rs. 1210.
CI is Rs. 210.

Final answer: Rs. 210

Why this is fast: Using the growth factor avoids calculating each year's interest separately.

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Q1 Easy

In a Compound Interest practice set, a student answers 18 questions correctly out of 24. What percentage is correct?

Concept type: Compound growth on accumulated amount Shortcut used: Use A = P(1 + R/100)^T for annual compounding, then CI = A - P. Quick hint: Compound interest is earned on principal plus previously accumulated interest.

Quick idea: Correct percentage = 18/24 x 100 = 75%.

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