Selling item in 2 parts with given profit% or loss% (3)
Duration: 9 min
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This educational video, presented by Yash Jain, is a tutorial on solving profit and loss problems where two items are sold at different profit and loss percentages, but the overall transaction results in no net profit or loss. The video begins with a title slide for 'MIXTURES & ALLIGATIONS' and transitions to a problem-solving session. The core concept demonstrated is the use of the alligation method, a technique for finding the ratio in which two or more ingredients at different prices must be mixed to produce a mixture at a given price. The instructor applies this method to two distinct problems: first, calculating the selling prices of two toy Tesla cars sold for a total of Rs. 1500, with one sold at a 3% loss and the other at a 7% profit, resulting in no overall profit or loss; second, solving a similar problem for two speakers sold for Rs. 1290, with one at a 9% loss and the other at a 12.5% profit. The solution process involves setting up a diagram with the profit and loss percentages, calculating the ratio of the cost prices, and then using this ratio to find the individual selling prices. The video concludes with a 'Thanks for Watching' screen.
Chapters
0:00 – 2:00 00:00-02:00
The video opens with a cartoon illustration of a scientist in a lab, followed by a title slide for a lecture on 'MIXTURES & ALLIGATIONS' by Yash Jain, a Knowledge Gate Educator. The instructor, visible in a small window, introduces the topic. The next slide presents the first problem: 'Two Toy Tesla Cars were sold for Rs. 1500. One was sold at a loss of 3% and the other at a profit of 7%. If there was no profit no loss on the whole, find the selling price of each Toy Tesla Car.' The instructor begins to explain the problem, setting up the context for the alligation method.
2:00 – 5:00 02:00-05:00
The instructor begins to solve the first problem using the alligation method. He writes on a digital whiteboard, showing the profit and loss percentages: +7% and -3%. He explains that the overall profit is 0%, which is the mean value. He then draws a diagram, placing the mean (0%) in the center, the profit (7%) on the left, and the loss (-3%) on the right. He calculates the difference between the mean and each extreme value, resulting in 7 and 3, respectively. This gives the ratio of the cost prices as 3:7. He then uses this ratio to find the cost prices, calculating 3/10 of 1500 as 450 and 7/10 of 1500 as 1050. Finally, he calculates the selling prices: 450 * 1.07 = 481.5 and 1050 * 0.97 = 1018.5.
5:00 – 9:11 05:00-09:11
The video transitions to a second problem: 'Two speakers were sold for Rs. 1290. On one, there was loss of 9% and on the other there was profit of 12.5%. If there was no profit no loss overall, find the selling price of each speaker.' The instructor applies the same alligation method. He writes the percentages: +12.5% and -9%. The mean is 0%. He calculates the differences: 12.5 - 0 = 12.5 and 0 - (-9) = 9. This gives a ratio of 9:12.5, which he simplifies to 18:25. He then calculates the cost prices: 18/43 of 1290 = 540 and 25/43 of 1290 = 750. Finally, he calculates the selling prices: 540 * 0.91 = 491.4 and 750 * 1.125 = 843.6. The video ends with a 'Thanks for Watching' screen.
The video provides a clear, step-by-step demonstration of the alligation method for solving profit and loss problems. It begins by establishing the core principle: when there is no overall profit or loss, the total cost price equals the total selling price. The instructor then uses a visual diagram to find the ratio of the cost prices of the two items based on their individual profit and loss percentages. This ratio is then applied to the total selling price to find the individual cost prices, from which the selling prices are calculated. The method is effectively demonstrated on two different problems, reinforcing the concept and showing its versatility.