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Simple Interest Questions and Answers – Page 3

Simple Interest is a fundamental Quantitative Aptitude topic that forms the basis of commercial mathematics questions asked in SSC CGL, SSC CHSL, IBPS PO, IBPS Clerk, SBI PO, SBI Clerk, RRB NTPC, and other banking and government job examinations. Simple Interest is the interest calculated only on the original principal amount throughout the loan or investment period, using the formula SI equals Principal multiplied by Rate multiplied by Time, divided by 100. Understanding this concept thoroughly is essential because it lays the groundwork for more advanced topics such as Compound Interest, and it frequently appears in combination with percentage and ratio-based questions in competitive exams. This topic page provides an extensive collection of simple interest questions with detailed, step-by-step solutions to help aspirants build both conceptual clarity and calculation speed. The practice questions cover important variations such as finding principal, rate, or time when other values are known, calculating amount and interest together, problems involving installments, and comparisons between simple interest and compound interest. Each solution includes clear explanations along with shortcut formulas that make solving simple interest problems faster and more efficient during the exam. Aspirants preparing for banking, SSC, and railway exams often find simple interest questions tricky when multiple unknowns need to be calculated simultaneously or when the problem involves comparing simple and compound interest over the same period. Our practice set addresses these challenges through clear worked examples, rearranged formula shortcuts, and quick calculation tricks for finding any missing variable in the simple interest equation. Regular practice with these questions will strengthen your overall Quantitative Aptitude preparation and build a strong foundation for interest-based problems. Whether you are a beginner starting your preparation or an experienced aspirant refining your calculation speed, this simple interest question bank is designed to support learners at every level. Practice consistently, apply the shortcut methods provided, and use them to solve simple interest questions accurately and quickly in your upcoming SSC, banking, railway, and other competitive government examinations.

Exams Covered:

SSC CGL
SSC CHSL
SSC MTS
IBPS PO
IBPS Clerk
RRB NTPC
UPSC
State Exams
& More

FAQ

Simple Interest FAQs

Common questions and clear answers for this topic.

What is Simple Interest and what is the basic formula?

Simple Interest (SI) is interest calculated only on the original principal amount. Formula: SI = (P x R x T) / 100, where P = Principal, R = Rate of interest per annum, T = Time in years. Amount = P + SI = P(1 + RT/100). Simple Interest is a key topic in SSC CGL, IBPS Bank PO, SBI Clerk, Railway, and all competitive exams.

How to find Principal, Rate, or Time when Simple Interest is given?

From SI formula: P = (SI x 100) / (R x T). R = (SI x 100) / (P x T). T = (SI x 100) / (P x R). Example: If SI is Rs 600, Principal Rs 5000, Time 3 years, then Rate = (600 x 100)/(5000 x 3) = 4% per annum. Shortcut: If SI doubles the principal (SI = P), then Time x Rate = 100.

What is the difference between Simple Interest and Compound Interest?

Simple Interest (SI): Interest calculated only on principal. Amount after n years = P + PRT/100. Compound Interest (CI): Interest calculated on principal plus accumulated interest. Amount = P(1 + R/100)^n. CI is always greater than SI for same P, R, T. Difference for 2 years: CI - SI = P(R/100) squared. These formulas help solve comparison problems in banking exams.

What are common Simple Interest problems in competitive exams?

Common SI problem types: 1) Find SI when P, R, T given, 2) Find P or R or T when other values given, 3) Money doubles/triples problems, 4) Two investments at different rates. Useful shortcuts: Money doubles when RT = 100. Money becomes 3 times when RT = 200. Money becomes n times when RT = 100(n-1). Practice at least 10 SI problems daily for competitive exam preparation.

How to solve mixture of Simple Interest problems in bank exams?

Mixed SI problems: If total interest from two loans (P1 at R1% and P2 at R2%) for T years is I, then P1 x R1 + P2 x R2 = I x 100/T. For equal SI from two investments: P1/P2 = R2 x T2 / (R1 x T1). Annual repayment installment formula for equal installments over n years at r% SI also appears in IBPS PO Mains.

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Top Simple Interest in Quantitative Aptitude Questions – Page 3 | Exambodh