Simple Interest for SSC CGL | Concepts & Practice

Learn the shortcut

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

Avoid common traps

See where students commonly lose marks so you can eliminate bad options earlier.

Solve faster in exam

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

Summary Formula Tricks Mistakes Solved Example Practice FAQ

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

Simple Interest is calculated on the original principal for every time period, so the interest per equal period remains constant when rate and principal do not change.

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

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

Core concept
Key formula/relation
Common trap
Approved practice

SI = PRT/100
Amount = P + SI

If interest for one year is known, multiply it by the required number of years when principal and rate remain unchanged.

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You can start learning here right away, explore formulas and tricks, and use the current limited practice flow before premium tools arrive.

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: A sum becomes Rs. 6,600 in 2 years at 10% simple interest per annum. What is the principal?

Solution: The principal is Rs. 5,500.

Find the simple interest on Rs. 7,500 at 6% per annum for 2 years.
Find the simple interest on Rs. 9,000 at 7% per annum for 4 years.
Find the simple interest on ₹1000 at 4% per annum for 2 years.

Learn the shortcut first

Shortcut before you solve

Simple Interest is direct once principal, 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

Start with the first 10 questions free, then unlock the rest with premium

Now apply the trick on real questions

Use the shortcut above before solving these questions

Use SI = P x R x T / 100 after confirming that interest is calculated only on the original principal.

Tip: Simple interest adds the same interest amount for each equal time period when rate and principal stay constant.

Step 1

Use SI = P x R x T / 100.

Step 2

SI = 1000 x 10 x 2 / 100 = Rs. 200.

Rule

Simple interest is calculated on the original principal throughout the period.

3-second trick

Identify P, R and T, then substitute directly into PRT/100.

Trap to avoid

Do not compound previous interest into the principal.

Correct answer

Rs. 200

Thinking path

Principal = 1000.
Rate = 10% per annum.
Time = 2 years.
Interest = 200.

Final answer: Rs. 200

Why this is fast: The direct PRT/100 formula gives SI in one line.

Free now: first 10 questions Premium later: full solutions, advanced tricks, targeted practice

Q1 Easy

Find the simple interest on Rs. 9,000 at 7% per annum for 4 years.