Interest

Interest – Verified PYQ Authority Guide

Interestis organised as a topic-level PYQ authority page. It brings together the strongest verified question clusters, exam/year coverage and concept-level practice so students can revise the topic without jumping through unrelated notes. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.

PYQ evidence snapshot

56 verified PYQsare currently mapped to this Topic hub out of 57 total mapped questions. The represented years include2025. Exam coverage currently includesRRB NTPC Under Graduate Level. Subject context includesQuantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.

Most useful verified PYQs to solve first

Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.

1. Priya invested ₹3200 in a bank at a simple interest rate of 12% per annum. If she kept her money in the bank for 5 years, what will be the total interest…
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches ₹1920.
2. Two equal sums of money are lent out for 2 years each, one at 5% per annum simple interest and the other at 7% per annum simple interest. If the difference in…
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches 1,000.
3. A sum becomes ₹9,075 after 2 years at 10% per annum compound interest, compounded annually. What was the principal amount (in ₹)?
   RRB NTPC Under Graduate Level · 2025 · Compound Interest
   Use the standard Compound Interest method and simplify; the result matches 7,500.
4. The simple interest on ₹55,000 at 5.5% per annum simple rate of interest is ₹______ in 5.5 years.
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches 16,637.5.
5. Priya lent ₹920 to her friend at 5% per annum simple interest for 3 years. How much simple interest does she earn in this period?
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches ₹138.
6. The simple interest on a certain sum for 4 years at 10% interest per annum is ₹3,200. What will be the amount payable after 6 years at the same rate?
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches ₹12,800.
7. Find the compound interest on ₹25,600 at the rate of % interest per annum for 2 years 3 months, compounded annually.
   RRB NTPC Under Graduate Level · 2025 · Compound Interest
   Use the standard Compound Interest method and simplify; the result matches ₹7,812.50.
8. If a sum is invested at a simple interest rate of 8% per annum for 9 months to earn an interest of ₹18,000, what was the principal amount invested?
   RRB NTPC Under Graduate Level · 2025 · Simple Interest
   Use the standard Simple Interest method and simplify; the result matches ₹3,00,000.

Formula & key-relationship bank from verified solutions

• SI = (P × R × T) / 100; Amount = P + SI
• A = P(1 + R/100)^n; CI = A − P

Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.

Core ideas repeatedly reinforced by the solved corpus

• Use the standard Simple Interest method and simplify; the result matches ₹1920.
• Use the standard Simple Interest method and simplify; the result matches 1,000.
• Use the standard Compound Interest method and simplify; the result matches 7,500.
• Use the standard Simple Interest method and simplify; the result matches 16,637.5.
• Use the standard Simple Interest method and simplify; the result matches ₹138.

Exam tips already validated in SRO solutions

• Identify the Simple Interest relationship before calculation and keep units/bases consistent.
• Identify the Compound Interest relationship before calculation and keep units/bases consistent.

Common mistakes to avoid

• Using a shortcut without checking its conditions or using the wrong base/unit.

Topic and concept coverage

Mapped topic labels includeInterest. The concept trail includesSimple Interest, Compound Interest. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.

Knowledge Graph navigation

Continue withArithmetic,CI and SI Difference,Compound Interest,Simple Interest,Quantitative Aptitude,Simple Interest,Compound Interest. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.

How to revise this authority page efficiently

1. Solve before reading:answer a mapped PYQ first.
2. Read the exact explanation:verify the correct principle, formula, distractor logic and common mistake on that question page.
3. Move one level in the graph:use the closest concept/sub-topic/topic link rather than opening unrelated content.
4. Reattempt:solve another verified PYQ from this hub and check whether the same error repeats.

Quality scope:this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.