Percentage for SSC CPO | Concepts & Practice | SSC CPO Quantitative Aptitude

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

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

Percentage expresses a quantity per hundred and acts as the base language for profit-loss, interest, discount and data interpretation. Always identify what value is being treated as 100%.

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

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

Core concept
Key formula/relation
Common trap
Approved practice

x% of y = xy/100
% change = Change/Original × 100
New value after p% rise = Original × (1+p/100)

Useful conversions: 50%=1/2, 25%=1/4, 20%=1/5, 12.5%=1/8, 10%=1/10.

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Ready to practice this topic?

Solve topic-wise questions, measure accuracy, identify weak areas, and prepare for mock tests faster with a sharper revision flow.

Topic-wise practice built around this concept
Accuracy-focused repetition before full mocks
Weak-area clarity for smarter revision
Faster transition into timed tests

Practice Questions Login for free progress tracking

Free now

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: What is 17.5% of 720?

Solution: 17.5% of 720 is 126.

A price is increased by 20% and then reduced by 10%. What is the net percentage change?
What is 22.5% of 880?
A population increases by 10% in the first year and 20% in the second year. What is the total percentage increase?

Learn the shortcut first

Shortcut before you solve

Fast percentage questions become easy when you convert to fractions immediately.

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

Convert common percentages into fractions first, then calculate mentally.

Tip: Remember 25% = 1/4, 12.5% = 1/8, 20% = 1/5, and 50% = 1/2 before solving.

Step 1

25% means 1/4.

Step 2

1/4 of 360 is 90.

Rule

Percentage = part / total x 100, but common values should be converted to fractions for speed.

3-second trick

Replace the percent with a fraction and divide before multiplying.

Trap to avoid

Do not multiply first if the number can be simplified quickly.

Correct answer

90

Thinking path

25% is a standard fraction value.
1/4 of 360 is faster than writing the full percentage formula.
This saves time and avoids arithmetic mistakes.

Final answer: 90

Why this is fast: Fraction conversion removes one whole calculation step.

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

Q1 Medium

A number is decreased by 15% and becomes 340. Find the original number.