Caselet Data Interpretation is one of the most challenging DI formats in IBPS PO Prelims because there are no ready-made tables or graphs. Instead, you receive a paragraph (sometimes two) packed with numerical relationships, percentages, and conditions. Your job is to extract the data, organize it into a self-made table, and then answer 4–5 questions based on it.
This topic tests two skills simultaneously: reading comprehension and quantitative reasoning. Many students who excel at standard DI struggle here because they skip the crucial step of structuring the data before solving. Caselet questions typically carry 5 marks in a set, making them high-value if you're comfortable with them—and time-sinks if you're not.
Mastering caselets requires practice in translating verbal information into equations or tables. Once you build this habit, caselets become easier than they first appear because the calculations themselves are usually straightforward.
---
Key Concepts
**Data extraction is the real problem.** The math is secondary. Spend 2–3 minutes reading carefully and building your table before touching any question.
**Identify the base variable first.** Most caselets define everything in terms of one unknown (like total employees, total production, or a person's income). Find it and assign it a variable.
**Percentages and ratios are the two common formats.** Caselets express relationships as "A is 20% more than B" or "A and B are in the ratio 3:4." Convert these into equations immediately.
**Watch for nested relationships.** "A is 25% of total, and B is 40% of A" means you must compute A first, then B. Don't jump steps.
**Caselets often have multiple categories.** Example: five employees, three departments, two years. Build a multi-row, multi-column table to capture all dimensions.
**Assume total = 100 or use LCM when percentages dominate.** This simplifies arithmetic and avoids fractions.
**Not all information appears in order.** The paragraph might mention C before defining A and B. Read the entire passage before writing anything.
---
Formulas / Key Facts
**Percentage Relationships**
A is x% more than B → A = B × (1 + x/100)
A is x% less than B → A = B × (1 − x/100)
A is x% of B → A = B × (x/100)
If A is x% more than B, then B is [x/(100+x)] × 100 % less than A
**Ratio Conversions**
If A : B = 3 : 4 and total = 70, then A = 30, B = 40
Need more? Ask Shishya
Shishya is your personal tutor for this topic. Pick a starter or open a free chat.
If A : B : C = 2 : 3 : 5, then A = 2k, B = 3k, C = 5k (solve for k using any given total or value)
**Common Caselet Scenarios**
| Scenario | What to Build | |----------|---------------| | Income-Expenditure-Savings | Table with rows for each person, columns for income, expenditure, savings | | Production across years | Table with rows for products, columns for years | | Department-wise employees | Table with departments as rows, categories (male/female, permanent/contract) as columns | | Sales-Profit across branches | Table with branches as rows, sales and profit as columns |
---
Worked Examples
### Example 1: Basic Caselet
**Passage:** A company has three departments: HR, Finance, and IT. The total number of employees is 600. HR has 25% of the total employees. Finance has 40 more employees than HR. The remaining employees work in IT.
**Questions:** (a) How many employees are in Finance? (b) What percentage of total employees work in IT?
**Passage:** Ravi's monthly income is Rs. 50,000. He spends 30% on rent and 25% of the remaining amount on food. From what is left after rent and food, he saves 40% and spends the rest on miscellaneous expenses.
**Questions:** (a) What is Ravi's monthly saving? (b) How much does he spend on miscellaneous expenses?
**Solution:**
Step 1: Income = 50,000
Step 2: Rent = 30% of 50,000 = 15,000 Remaining after rent = 50,000 − 15,000 = 35,000
Step 3: Food = 25% of 35,000 = 8,750 Remaining after rent and food = 35,000 − 8,750 = 26,250
Step 4: Savings = 40% of 26,250 = 10,500 Miscellaneous = 60% of 26,250 = 15,750
(a) Savings = **Rs. 10,500**
(b) Miscellaneous = **Rs. 15,750**
---
### Example 3: Ratio-Based Caselet
**Passage:** Three friends A, B, and C invested in a business. A's investment is 20% more than B's investment. C invested Rs. 6,000, which is 75% of B's investment.
**Questions:** (a) What is B's investment? (b) What is the ratio of A's investment to total investment?
**Solution:**
Step 1: C = 75% of B → 6,000 = 0.75 × B → B = 8,000
Step 2: A = B + 20% of B = 8,000 × 1.2 = 9,600
Step 3: Total = A + B + C = 9,600 + 8,000 + 6,000 = 23,600
| Wrong Thinking | Correct Fix | |----------------|-------------| | Jumping to questions without fully reading the passage | Always read the entire caselet first; build a complete table before solving. | | Calculating "25% more" as just 25% of the value | "A is 25% more than B" means A = 1.25 × B, not A = B + 25. | | Confusing "25% of remaining" with "25% of total" | Track exactly which base the percentage applies to; underline key phrases. | | Assuming all values add up to 100 when ratios are involved | Ratios give proportions, not percentages; convert using the total if given. | | Spending too much time on one caselet set | If data extraction takes more than 3 minutes, mark and move on; return later. |