These five sets cover the main chart types used in bank and SSC DI sections: a table, a bar graph, a pie chart, a line graph and a caselet. All the data is invented practice data, written for this page. Time yourself for three to four minutes per set, answer the questions below, then read the explanations, which show the shortest working and name the trap behind each wrong option.
Books sold by a shop, in hundred copies.
| Genre | 2024 | 2025 |
|---|---|---|
| Fiction | 120 | 150 |
| Science | 80 | 92 |
| History | 60 | 54 |
| Children's | 90 | 117 |
Questions 1 to 3 below use this table. Method: table DI.
Questions 4 to 6 use this graph. Method: bar graph DI.
Questions 7 to 9 use this chart. Method: pie chart DI.
Questions 10 to 12 use this graph. Method: line graph DI.
A company has 800 employees, of whom 40% are women. A quarter of the women and half of the men work in the IT department; everyone else works outside IT.
Questions 13 to 15 use this caselet. Turn it into a two-by-two table of men and women, in IT and outside IT, before answering. Method: caselet DI.
Q1. Set 1 (table). By what percentage did sales of children's books rise from 2024 to 2025? easy
✅ Answer: (b) 30%
💡 Explanation: Children's books rose from 90 to 117 hundred copies. The increase is 27 on a base of 90: 27 ÷ 90 × 100 = 30%. Dividing by the new value, 117, is the usual mistake.
Q2. Set 1 (table). What were the shop's total book sales in 2025, in hundred copies? easy
✅ Answer: (c) 413
💡 Explanation: Add the 2025 column: 150 + 92 + 54 + 117 = 413 hundred copies.
Q3. Set 1 (table). By what percentage did history sales fall from 2024 to 2025? medium
✅ Answer: (a) 10%
💡 Explanation: History fell from 60 to 54, a drop of 6 on a base of 60. 6 ÷ 60 × 100 = 10%. The 11.1% option divides by 54 instead of the starting value.
Q4. Set 2 (bar graph). What is the average number of students who passed per school? easy
✅ Answer: (d) 140
💡 Explanation: The five bars add to 120 + 150 + 90 + 180 + 160 = 700 students. 700 ÷ 5 = 140.
Q5. Set 2 (bar graph). The number who passed in school D is what percentage more than in school C? medium
✅ Answer: (b) 100%
💡 Explanation: D has 180 and C has 90. The difference, 90, equals C's whole value, so D is 100% more. 200% is D as a percentage of C, a different question.
Q6. Set 2 (bar graph). What is the ratio of students who passed in school B to those in school E? easy
✅ Answer: (c) 15 : 16
💡 Explanation: B has 150 and E has 160. Dividing both by 10 gives 15 : 16, which has no further common factor.
Q7. Set 3 (pie chart). How much does the hostel spend on staff each month? easy
✅ Answer: (a) ₹30,000
💡 Explanation: Staff takes 25% of ₹1,20,000. A quarter of 1,20,000 is ₹30,000.
Q8. Set 3 (pie chart). What is the central angle of the electricity sector? medium
✅ Answer: (c) 54°
💡 Explanation: Each 1% of a pie chart is 3.6°, so 15% is 15 × 3.6 = 54°.
Q9. Set 3 (pie chart). By how much does monthly spending on food exceed spending on maintenance? medium
✅ Answer: (b) ₹33,600
💡 Explanation: Food is 40% and maintenance 12%, a gap of 28 percentage points. 28% of ₹1,20,000 = ₹33,600. Subtracting the percentages first saves one multiplication.
Q10. Set 4 (line graph). In which year did profit grow by the highest percentage over the previous year? medium
✅ Answer: (d) 2025
💡 Explanation: Growth was 25% in 2022 (20 to 25), 20% in 2023 (25 to 30), −20% in 2024 (30 to 24) and 50% in 2025 (24 to 36). The 2025 rise has both the largest gain and a small base.
Q11. Set 4 (line graph). What was the firm's average annual profit over the five years? easy
✅ Answer: (d) ₹27 lakh
💡 Explanation: The five values add to 20 + 25 + 30 + 24 + 36 = 135 lakh. 135 ÷ 5 = ₹27 lakh.
Q12. Set 4 (line graph). By what percentage did profit fall in 2024? easy
✅ Answer: (a) 20%
💡 Explanation: Profit fell from 30 to 24 lakh, a drop of 6 on a base of 30. 6 ÷ 30 × 100 = 20%. Using 24 as the base gives the wrong answer of 25%.
Q13. Set 5 (caselet). How many employees work in IT? medium
✅ Answer: (b) 320
💡 Explanation: Women: 40% of 800 = 320, and 25% of them, 80, are in IT. Men: 480, and half of them, 240, are in IT. Total IT = 80 + 240 = 320.
Q14. Set 5 (caselet). What percentage of the IT staff are women? medium
✅ Answer: (c) 25%
💡 Explanation: 80 of the 320 IT employees are women. 80 ÷ 320 × 100 = 25%. The 40% option is the share of women in the whole company, not in IT.
Q15. Set 5 (caselet). What is the ratio of men outside IT to women outside IT? hard
✅ Answer: (d) 1 : 1
💡 Explanation: Men outside IT: 480 − 240 = 240. Women outside IT: 320 − 80 = 240. The ratio is 240 : 240 = 1 : 1.
How many DI sets should I practise each day?
Quality matters more than volume. Two or three timed sets a day, each reviewed afterwards for why any answer went wrong, builds speed faster than racing through ten. Keep a note of the trap that caught you and look for it next time.
How much time should one DI set take in a bank exam?
There is no fixed rule, but most candidates aim for roughly a minute per question in prelims, slightly more in mains. Reading the chart carefully once at the start is what makes the later questions quick.
All problems and solutions on this page are original. No outside facts are relied on; every numeric answer is recomputed by software before publishing.
How this page was prepared. Drafted with AI assistance (Claude (Anthropic AI model)) from the sources listed above. 15 calculations on this page were recomputed by software and matched. Automated checks also covered structure, internal links and duplicate text. Software checks cannot confirm facts. Reviewed by praveenkumar on 2026-10-24 against the sources listed above.
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