RRB PO Simple and Compound Interest Questions, Download Free PDF

RRB PO Exam is going to be conducted in less than a month. In such a situation, it is very important to prepare the complex topics on a priority basis, as they require much practice and to practice, you require time. As it cannot be prepared in the last 5-6 days so this is the appropriate time to prepare such topics. Preparing well for this topic not only boosts your Quant score but also strengthens your performance in related topics like Profit & Loss, Ratio, and Data Interpretation. In this blog, we are going to discuss the common types of questions asked from simple and compound interest with examples, along with some preparation tips. We will also provide a PDF that contains questions for practice. 

Download Simple and Compound Interest Questions PDF

In this section, we are providing a PDF that contains Simple and Compound Interest question PDF along with solution to get yourself exam ready for the upcoming RRB PO Exams.

Weightage of Simple and Compound Interest Questions in RRB PO Exams

In this section, we are giving an estimation of the weightage of simple and compound interest questions in RRB PO Exams. 

Topic	Approx. No. of Questions	Difficulty Level
Simple Interest	2–3	Easy to Moderate
Compound Interest	2–3	Moderate
Combined (SI + CI or Data-based Interest)	1–2	Moderate to High

Key Concepts and Formulas

To solve SI and CI questions efficiently, it’s essential to memorise and understand the key formulas. In this section, we are discussing the same. 

Simple Interest (SI)

Formula:
SI=P×R×T/100

Where,
P = Principal
R = Rate of Interest
T = Time (in years)

Compound Interest (CI)

Formula:
CI=P(1+R/100)^T−P

Or,
CI=A−P, where A = Final Amount.

Difference between CI and SI

For 2 years:
CI−SI=P×(R/100)²

For 3 years:
CI−SI=P×(R/100)²×(300+R/100)

Understanding these differences helps solve advanced-level questions quickly.

Common Types of Questions Asked in RRB PO Exams

You can see a variety of questions asked about this topic in the exam. Here, we are discussing the common types of questions that were asked in previous years’ examinations. 

Basic Formula-based Problems

These are Direct applications of SI or CI formulas. Example: 

Question:
Find the simple interest on ₹6,000 at 10% per annum for 3 years.

Solution:
Using the formula
SI=P×R×T/100

SI=6000×10×3/100=₹1800

Answer: ₹1800

Difference between SI and CI

Finding the extra amount earned in CI over SI. 

Example: 

Question:
Find the difference between compound interest and simple interest on ₹5,000 at 8% per annum for 2 years.

Solution:
Difference = P×(R/100)²

= 5000×(8/100)²=5000×64/10000=₹32

Answer: ₹32

Rate or Time Calculation

In this type of question, interest is given along with principal, you’ve to find the missing values.

Example: If the simple interest on ₹4,000 for 2 years is ₹800, find the rate of interest per annum.

Solution:
Using SI=P×R×T/100​

800=4000×R×2/100

R=800×100/4000×2=10%

Answer: 10% per annum

Successive Rates

Compound interest questions involving different rates for different years. 

For example: Find the compound interest on ₹10,000 for 2 years if the rate of interest is 10% for the first year and 12% for the second year.

Solution:
Amount after 1st year = 10000×110/100=11000

 Amount after 2nd year = 11000×112/100=12320

Compound Interest = 12320−10000=₹2320

 Answer: ₹2320

Data Interpretation-based Interest Questions

These types of simple and compound interest questions are generally found in Mains, where you analyse tabular or graph-based interest data.

Question:
A table shows investments of three persons at 10% simple interest for 2 years.

Person	Principal (₹)
A	5,000
B	8,000
C	10,000

Find the total interest earned by all three together.

  Solution:
 Interest (A) = 5000×10×2/100=₹1000

Interest (B) = 8000×10×2/100=₹160

Interest (C) = 10000×10×2/100=₹2000

Total Interest = ₹1000 + ₹1600 + ₹2000 = ₹4600

Answer: ₹4600

Combined Arithmetic Questions –

In this, mixed types of questions are asked.  Interest mixed with ratio, profit & loss, or percentage.
Question:
A man invests ₹8,000 at 10% compound interest per annum. He uses the interest earned after 2 years to buy goods and sells them at 25% profit. Find his total profit after selling the goods.

Solution:
Compound Interest for 2 years
=8000×(1+10/100)²−8000=8000×1.21−8000=₹1680

Profit on selling goods = 25% of ₹1680 = 25/100×1680=₹420

Total Profit = ₹420

Preparation Strategy for RRB PO Simple and Compound Interest Questions

In this section, we are going to discuss how you should prepare such a complex but scoring topic to get a better score in the examination. 

• Learn quick multiplication and fraction-percentage conversions. These small improvements can save 10-15 seconds per question in the exam.
• Before heading towards solving the questions, revise fundamental formulas and relationships between principal, rate, time, and amount. This will help you in applying the formula while solving questions.
• Begin with simple formula-based problems before moving to multi-concept questions that mix SI, CI, and percentages. For example, instead of calculating CI year by year, use the formula directly or apply percentage increase logic. Also, always check the time unit (years, months, or days) before applying the formula.
• Include at least two Arithmetic sectional mocks per week. Review every mistake and note where you commit mistakes- is it conceptual, calculative, or careless? Also, while solving the compound interest questions, make sure you avoid rounding too early in compound interest questions, try to keep at least two decimal points until the final answer.
  
• Make a formula sheet with all interest-related formulas and short tricks. Regular revision helps retain them during the final week before the exam.

Conclusion

In this article, we have discussed the types of common questions asked, along with the PDF to solve. To solve questions from more such topics, you can buy our test series, where you can get reattempt the full-length mock tests and get a Detailed Comparison with the Topper, compare your Time, Score, Accuracy, Correct/Wrong Answers, and even the Average Performance side-by-side. 

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