Profit Loss Percent on Multiple Items

Duration: 9 min

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Inside: a video lesson and guided study material.

Module outline

  1. Quantitative Ability: Percentage, Profit and Loss, Ratio and Proportion (Ratios), Average, Time and Work, Speed Time and Distance, Simple Interest and Compound Interest, Age Problems, Number System, Divisibility Rules, HCF LCM, Algebra, Permutation and Combination, Probability, Data Interpretation, Logarithm, Sequence and Series (Series), Powers and Exponents (Surds and Indices), Speed Mathematics and Basic Mathematics
  2. Logical Reasoning: Seating Arrangements, Puzzle Solving (Puzzles), Data Arrangement, Coding Decoding, Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Data Sufficiency, Venn Diagram, Inequality, Series (Number and Letter Series) (Numerical Relations and Reasoning), Logical Sequence Of Words, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Selection Decision Table (Decision Making), Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning)
  3. Verbal Ability: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Subject Verb Agreement (Verb Noun Agreement), Tenses, Articles, Preposition, Conjunction, Modals, Active Passive Voice (Voice), Direct and Indirect Speech, Vocabulary, Sentence Re-arrangements (Para Jumbles) (Narrative Sequencing), Sentence Completion (Fill in the blanks), Sentence Correction (Error Correction), Cloze Test (Cloze Passage), Facts, Inference and Judgements
  4. Programming Fundamentals (Technical): C Fundamentals
  5. Data Structures (Technical): Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing
  6. Algorithms (Technical): Algorithm Analysis, Sorting Algorithms, Greedy Algorithms, Dynamic Programming, Minimum Spanning Trees, Shortest Path Algos, Time Complexity Analysis, Advanced Algorithms
  7. OOPs (Technical): Object Oriented Programming (OOPS)
  8. DBMS (Technical): 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
  9. SQL (Technical): SQL
  10. Operating Systems (Technical): 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
  11. Computer Networks (Technical): 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
  12. Software Engineering (Technical): Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing, Software Maintenance and Configuration Management
  13. Coding/Automata Round: Coding Questions by Yash Sir, C Programming by Yash Sir, Programming in C++, Java, Python for Placements by Yash Sir, Pseudo Codes
  14. Personality / Behavioral Assessment: Behavioral Assessment (Behavioral Competency Profiling) (Psychometric Test)
  15. Writing Assessment: English Writing Ability
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

This video is a tutorial on solving a profit and loss problem from an Infosys exam, presented by an instructor from Knowledge Gate. The core problem involves a man who buys 11 Surflexcel pouches for 10 rupees and sells 10 pouches for 11 rupees, and the task is to find the total profit or loss percentage. The instructor first demonstrates the 'traditional method' by calculating the cost price (CP) and selling price (SP) per pouch, then determining the total CP and SP for a common number of pouches (110) to find the overall profit percentage. He then introduces a 'short trick' method, which uses the formula: (a/b) * (c/d) - 1, where a is the number of items bought, b is the cost for those items, c is the number of items sold, and d is the selling price for those items. This trick directly yields the profit percentage. The video uses a digital whiteboard to write out the calculations and formulas, and the instructor explains each step clearly.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The video opens with a title card for a problem from an Infosys exam, asking to find the total profit or loss percentage for a transaction involving Surflexcel pouches. The instructor, Yash Jain Sir, introduces the problem: a man purchases 11 pouches for 10 rupees and sells 10 pouches for 11 rupees. He states that the question is from the Infosys exam (2010) and will be solved using a traditional method. The on-screen text clearly presents the problem statement and the instructor's name and channel, Knowledge Gate Educator.

  2. 2:00 – 5:00 02:00-05:00

    The instructor begins the 'traditional method' of solving the problem. He writes on a digital whiteboard, first calculating the cost price (CP) per pouch as 10/11 rupees and the selling price (SP) per pouch as 11/10 rupees. He then explains that to find the overall profit, he needs a common number of pouches. He calculates the total cost for 110 pouches (110 * 10/11 = 100 rupees) and the total selling price for 110 pouches (110 * 11/10 = 121 rupees). The profit is 121 - 100 = 21 rupees. The profit percentage is then calculated as (21/100) * 100 = 21%.

  3. 5:00 – 8:37 05:00-08:37

    The instructor introduces a 'short trick' to solve the problem in 2-3 seconds. He writes the formula: (a/b) * (c/d) - 1, where a=11 (pouches bought), b=10 (cost), c=10 (pouches sold), d=11 (selling price). He substitutes the values: (11/10) * (10/11) - 1 = 1 - 1 = 0. He then explains that this is incorrect and corrects the formula to (a/b) * (d/c) - 1, which gives (11/10) * (11/10) - 1 = 121/100 - 1 = 21/100 = 21%. He confirms the answer is 21% profit. The video ends with a 'Thanks for Watching' screen.

The video effectively teaches a common aptitude test problem by first presenting a detailed, step-by-step traditional method to build a solid understanding of the underlying concepts of cost price, selling price, and profit percentage. It then transitions to a more efficient 'short trick' method, demonstrating how to apply a formula to solve the same problem quickly. This progression from foundational understanding to a time-saving technique is a classic pedagogical approach for exam preparation, ensuring students can both understand the logic and apply a fast solution under time pressure.

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