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in an office there were women and men employees.each women and men were contributed as many rupees as number of women and men in the office .if total collection was 482 rupees den find the number of employees in that office

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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.