Few Important Points for Percentages

Duration: 7 min

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Module outline

  1. Quantitative Aptitude: Number System, Divisibility Rules, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Mixture and Alligation, Partnership, Age Problems, Time and Work, Pipe and Cistern, Speed Time and Distance, Algebra, Arithmetic, Data Interpretation, Sequence and Series (Series), Logarithm, Powers and Exponents (Surds and Indices), Permutation and Combination, Probability, Speed Mathematics and Basic Mathematics, Trigonometry
  2. Logical Reasoning: Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Syllogisms, Inequality, Data Sufficiency, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Series (Number and Letter Series) (Numerical Relations and Reasoning), Venn Diagram, Logical Sequence Of Words, Calendar, Clock, Cubes & Dices, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning)
  3. Verbal Ability: Noun, Pronoun, Adjectives, Verb, Adverb, Tenses, Subject Verb Agreement (Verb Noun Agreement), Articles, Preposition, Conjunction, Modals, Determiner, Vocabulary, Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Cloze Test (Cloze Passage), Sentence Correction (Error Correction), Sentence Completion (Fill in the blanks), Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Active Passive Voice (Voice), Direct and Indirect Speech, Sentence Construction
  4. Data Structures (Domain Test): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  5. Algorithms (Domain Test): Algorithm Analysis, Sorting Algorithms, Time Complexity Analysis, Greedy Algorithms
  6. OOPs (Domain Test): Object Oriented Programming (OOPS)
  7. DBMS (Domain Test): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Decomposition Properties & 4NF, File Organization & Indexing, Relational Algebra, Relational Calculus, Transaction Management, Concurrency Control, Database Recovery, ORDBMS, Database Security & Authorization, Query Processing & Optimization, Enhanced Data Models, Data Warehousing & Mining, Big Data Systems, NoSQL
  8. SQL (Domain Test): SQL
  9. Operating Systems (Domain Test): Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Deadlock, Threads & Process Creation, Memory Management, Virtual Memory, Disc Scheduling, File Management, Windows OS, Linux OS, Security, Distributed Systems, Virtual Machines
  10. Computer Networks (Domain Test): Introduction to CN, Data Communication, DLL: Access Control, DLL: Flow Control, DLL: Error Control, DLL: Framing, Data Link Layer - Ethernet, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Net Layer:Routing Protocol, Transport Layer Services, TL: Congestion & UDP, Application Layer, Hardware basics, Network Security, Mobile Technology, Cloud Computing and IoT, Cyber and Info Security
  11. Coding: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir
  12. Written English Test: English Writing Ability
  13. Psychometric Test: Behavioral Assessment (Behavioral Competency Profiling) (Psychometric Test)
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This educational video lecture, presented by Yash Jain, provides a comprehensive introduction to the mathematical concept of percentages. The session begins by establishing foundational rules, specifically that the 'Original Value' or 'Base Value' is always treated as 100%. The instructor emphasizes the relationship between percentages and fractions, noting that in a fraction representation, the denominator corresponds to the original value while the numerator represents the resulted value. The lecture progresses to practical applications, using a savings example to demonstrate how to calculate portions of a total. It further explores the utility of the fraction method for solving problems involving income, expenses, and profit/loss scenarios, offering a streamlined approach to percentage calculations without relying solely on standard formulas.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title slide featuring falling dice and the word 'PERCENTAGE'. The instructor, Yash Jain, introduces the topic on a chalkboard-style background. He transitions to a slide titled 'FEW IMPORTANT POINTS' to outline core concepts. He explicitly states that the 'Original Value (Total Value/ Base Value) is always 100% or simply 100'. He reinforces this by writing 'A number itself is always 100%'. He then introduces the concept of fractions, writing 'fractions -> 1' on the board, and explains that in terms of fractions, the denominator is always the original value and the numerator is always the resulted value. This sets the stage for converting percentages into fractions for easier calculation.

  2. 2:00 – 5:00 02:00-05:00

    The instructor provides a concrete example: 'Savings is 20% of my income.' He explains that total income is assumed as 100%. If income is Rs. 100, savings are Rs. 20. He demonstrates scaling by showing that if income is Rs. 200, savings become Rs. 40, and if income is Rs. 1000, savings are Rs. 200. He then shifts to the fraction method, stating '20% = 1/5'. He sets up a table where Total income (assumed) is 5, Savings is 1, and Expenses are calculated as Income minus Savings, resulting in 4. He notes that Expenses equal 80%. This section highlights the efficiency of the fraction method over standard percentage formulas.

  3. 5:00 – 7:16 05:00-07:16

    The lecture concludes with an application to Profit and Loss. The instructor writes 'CP = 4, P = 1, SP = 5' to represent Cost Price, Profit, and Selling Price based on a 25% profit margin. He demonstrates how to find the actual Selling Price if the Cost Price is 180. By dividing 180 by 4, he finds the multiplier is 45. He then multiplies the Selling Price units (5) by 45 to get 225. The video ends with a 'THANKYOU FOR WATCHING' slide, summarizing the practical utility of the fraction method for quick percentage calculations in competitive exams.

The video effectively bridges the gap between theoretical percentage definitions and practical problem-solving techniques. By establishing the base value as 100% and linking it to fractions, the instructor provides a robust framework for handling various percentage problems. The progression from simple income/savings examples to more complex profit/loss scenarios demonstrates the versatility of the fraction method. This approach simplifies calculations, allowing students to solve problems mentally or with minimal writing, which is crucial for time-bound examinations. The clear visual aids and step-by-step examples ensure that the concepts are accessible and easy to revise.

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