Question 1

A student scored 72% marks in an exam. If the total marks were 150, how many marks did the student score?

Accepted Answer

Step 1: Marks scored = 72% of 150. Step 2: = 0.72 × 150 = 108 marks.

Question 2

A discount of 15% is offered on an item marked at ₹800. What is the selling price after discount?

Accepted Answer

Step 1: Discount = 15% of ₹800 = 0.15 × 800 = ₹120. Step 2: Selling price = Marked price - Discount = 800 - 120 = ₹680.

Question 3

A shopkeeper sells an item for ₹450, which is 125% of its cost price. What is the cost price of the item?

Accepted Answer

Step 1: Let cost price = CP. Step 2: Selling price = 125% of CP, so 450 = 1.25 × CP. Step 3: CP = 450 ÷ 1.25 = ₹360.

Question 4

In a school, 40% of students are boys. If there are 480 boys, what is the total number of students in the school?

Accepted Answer

Step 1: Let total students = T. Step 2: 40% of T = 480, so 0.40 × T = 480. Step 3: T = 480 ÷ 0.40 = 1200.

Question 5

A product's price increased from ₹200 to ₹250. What is the percentage increase in price?

Accepted Answer

Step 1: Increase = 250 - 200 = ₹50. Step 2: Percentage increase = (Increase ÷ Original) × 100 = (50 ÷ 200) × 100. Step 3: = 0.25 × 100 = 25%.

Question 6

If 35% of a number is 140, what is 60% of that number?

Accepted Answer

Step 1: Let the number = N. Step 2: 35% of N = 140, so 0.35 × N = 140. Step 3: N = 140 ÷ 0.35 = 400. Step 4: 60% of 400 = 0.60 × 400 = 240.

Question 7

A company's revenue increased from ₹80 lakhs to ₹100 lakhs. What is the percentage increase in revenue?

Accepted Answer

Step 1: Original revenue = ₹80 lakhs. Step 2: New revenue = ₹100 lakhs. Step 3: Increase = 100 − 80 = ₹20 lakhs. Step 4: Percentage increase = (Increase / Original) × 100 = (20 / 80) × 100 = (1/4) × 100 = 25%. Therefore, percentage increase = 25%.

Question 8

The price of a commodity was ₹250. After a 10% increase followed by a 10% decrease, what is the final price?

Accepted Answer

Step 1: Original price = ₹250. Step 2: After 10% increase: 250 × 1.10 = ₹275. Step 3: After 10% decrease on ₹275: 275 × 0.90 = ₹247.50. Therefore, final price = ₹247.50.

Question 9

A student's marks increased from 60 to 75. What is the percentage increase in marks?

Accepted Answer

Step 1: Original marks = 60. Step 2: New marks = 75. Step 3: Increase = 75 − 60 = 15. Step 4: Percentage increase = (15 / 60) × 100 = (1/4) × 100 = 25%. Therefore, percentage increase = 25%.

Question 10

A shopkeeper marks a product at ₹500. He offers a discount of 12% on the marked price. What is the selling price of the product?

Accepted Answer

Step 1: Marked Price (MP) = ₹500. Step 2: Discount = 12% of ₹500 = 0.12 × 500 = ₹60. Step 3: Selling Price (SP) = MP − Discount = 500 − 60 = ₹440. Therefore, the selling price is ₹440.

Question 11

In an examination, a student scored 65% marks and obtained 325 marks. What are the total marks for the examination?

Accepted Answer

Step 1: Let total marks = x. Step 2: 65% of x = 325. Step 3: (65/100) × x = 325. Step 4: x = 325 × (100/65) = 325 × (20/13) = 500. Therefore, total marks = 500.

Question 12

A number is increased by 25% and then decreased by 20%. What is the net percentage change in the number?

Accepted Answer

Step 1: Let the original number = 100. Step 2: After 25% increase: 100 + 25 = 125. Step 3: After 20% decrease on 125: 125 − (20% of 125) = 125 − 25 = 100. Wait, recalculate: 20% of 125 = 0.20 × 125 = 25. So final value = 125 − 25 = 100. Step 4: Net change = 100 − 100 = 0. Therefore, net percentage change = 0%.

Question 13

A shopkeeper marks up goods by 60% above cost price. He then offers a discount of 25% on the marked price. If the cost price of an item is ₹800, what is his profit percentage?

Accepted Answer

Step 1: Cost Price (CP) = ₹800. Marked Price (MP) = 800 + (60% of 800) = 800 + 480 = ₹1280. Step 2: Discount = 25% of 1280 = 0.25 × 1280 = ₹320. Selling Price (SP) = 1280 - 320 = ₹960. Step 3: Profit = SP - CP = 960 - 800 = ₹160. Profit % = (160/800) × 100 = 20%.

Question 14

A student scores 65% in English and 72% in Mathematics. If English has a weight of 40% and Mathematics has a weight of 60% in the final grade, what is the student's weighted percentage?

Accepted Answer

Step 1: Weighted percentage = (Score in English × Weight of English) + (Score in Mathematics × Weight of Mathematics). Step 2: = (65 × 0.40) + (72 × 0.60). Step 3: = 26 + 43.2 = 69.2%. Weighted percentage = 69.2%.

IBPS RRB PO Basic Percentage

IBPS RRB PO Basic Percentage — Past Exam Questions

Basic Percentage— Rules & Concept

Key Points to Remember

Exam-Specific Tips

60-Second Revision — Basic Percentage