Profit Loss Percent on Multiple Items

Duration: 9 min

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Inside: a video lesson and guided study material.

Module outline

  1. English Comprehension: Comprehension / Reading Comprehension / Unseen Passages (Critical Reasoning) (Paragraph Questions), Reading Comprehension, Vocabulary, Idioms and Phrases, Narrative Sequencing, Critical Reasoning
  2. Reasoning and Aptitude: Series (Number and Letter Series) (Numerical Relations and Reasoning), Coding Decoding, Analogy, Non Verbal Reasoning (Spatial Aptitude) (Spatial Reasoning) (Visual Reasoning), Blood Relations, Directions (Direction Test), Ranking, Order and Sequence, Logical Sequence Of Words, Seating Arrangements, Puzzle Solving (Puzzles), Syllogisms, Deductive and Inductive Reasoning (Logical Deduction and Induction) (Prepositional Reasoning), Data Sufficiency, Selection Decision Table (Decision Making), Calendar, Clock, Cubes & Dices, Data Arrangement, Venn Diagram, Analytical Reasoning (Counting Figures Reasoning), Number System, HCF LCM, Percentage, Ratio and Proportion (Ratios), Average, Profit and Loss, Simple Interest and Compound Interest, Speed Time and Distance, Mensuration and Geometry, Arithmetic, Mixture and Alligation, Age Problems, Data Interpretation, Alphabet and Word Tests, Numerical Reasoning, Number System, Averages, Mixtures and Alligation, Percentages, Series Completion, Analogy and Classification, Patterns in Two-Dimensional Figures, Coding and Decoding, Mathematical Operations, Direction Sense, Logical Deduction and Induction, Simplification and Approximation, Assembling and Grouping of Shapes, Transformation of Shapes, Three-Dimensional Patterns and Visualization, Cubes and Dice, Algebra, Traverse Surveying, Clocks and Calendars, Order, Ranking and Sequence, Constraint Puzzles, Syllogisms and Venn Diagrams, Ratio and Proportion, Mensuration, Permutations and Combinations, Project Monitoring, Resources and Safety, Profit, Loss and Discount, Sequences and Series, Powers, Surds and Logarithms, Subject-Verb Agreement, Sentence Completion, Geometry, Probability, Trigonometry, Measurement and Quantity Take-Off, Statistics, Data Sufficiency, Blood Relations, Speed, Time and Distance, Time and Work, Data Interpretation, Sequence and Series (Series), Algebra, Permutation and Combination, Combinatorics
  3. General Awareness: Physics, Chemistry, Biology, Geography, History, Polity, Indian Economy
  4. Computer Fundamentals: Basics of COA, Number System, Number Representation, Semiconductor Memories and Programmable Logic, Timing, Hazards and Testing, Processor Organization and Instructions, Number Systems and Codes, Combinational Logic Design, Combinational Logic Circuits, Number Systems and Codes
  5. Operating System: Introduction to OS, Unix OS, Linux OS
  6. C Programming: C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  7. OOPS with C++ & Java: OOPS with C++, Java
  8. Database Management System: Basics of DBMS, SQL
  9. MS Office: MS Office Applications
  10. Internet & Web Technologies: Website, Browser & Services, Internet Fundamentals, Web Design & Development, Protocols & Services
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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