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Rs 104000 ke labh ko 6:4:3 ke ratio me three hissedaro ashok, vimla or chirag me banta jana hai. Chirag ko kitna prapt hua

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is that app useful for me i need to write a exam for typist cum computer clerk

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Consider following question

A dishonest shopkeeper makes a cheating of 10% at the time of buying the good and 10% at the time of selling the goods. Find his profit %. 

I am solving it by proportion method. Let the cost price be CP. Then 10% cheating at buying mean, he is taking 1100 gm for every 1000gm. So here multiplication factor comes out to be (1100/1000) ie 11/10.

Now at the time of selling he is cheating again by 10% that means he is giving only 900gm instead of 1000gm. So here multiplying factor would be 10/9.

Now be cascading effect the net multiplying factor on CP comes out to be (11/10 * 9/10) ie 11/9.

So he has a profit of 2 out of 9 ie (200/9)%.

But answer in the textbook is 21%. Please look into and let me know where I am wrong.

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