📘 Simple Interest – Basic Formulas

Simple Interest is one of the most frequently asked topics in quantitative aptitude. Whether you are preparing for CAT, SSC CGL, Banking, or Railways exams, mastering this concept is essential. In this blog, we will explore:

✅ All important formulas
✅ Key concepts with shortcuts
✅ Different types of questions
✅ Practice problems

🔹 What is Simple Interest?

Simple Interest (SI) is the extra money paid or earned on the principal amount for a certain period at a fixed rate.

💡 Formula:
\( \text{SI} = \frac{P \times R \times T}{100} \)

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

📚 All Key Formulas

Concept	Formula
Simple Interest	\( \frac{P \times R \times T}{100} \)
Total Amount (A)	\( A = P + SI \)
Principal (P)	\( \frac{SI \times 100}{R \times T} \)
Rate (R)	\( \frac{SI \times 100}{P \times T} \)
Time (T)	\( \frac{SI \times 100}{P \times R} \)

💡 Shortcuts and Tricks

If SI is same in two setups: \( P_1 \times R_1 \times T_1 = P_2 \times R_2 \times T_2 \)
Convert months to years → 6 months = 0.5 years
Use percentage elimination technique in MCQs

🧠 Practice Questions Coming Soon!

We will be updating this blog every week with new SI questions + video solutions. Bookmark it!

📽️ Video Lessons

Watch our complete Simple Interest lecture here 👉 Subscribe to AzuCATion on YouTube

✅ Conclusion

Simple Interest is a scoring chapter. Once you master its logic and formulas, you'll easily be able to handle Compound Interest and Installment-based problems too. Stay tuned for more!

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