Question

By selling 20 books, a woman gains an amount equal to the selling price of 2 books. Find her profit percent ​

Answer 1

Answer:

11.11 %

Step-by-step explanation:

Let say Cost Price of a book  = C

Then cost Price of 20 books = 20C

Selling Price of one Book = S

=> Selling Price of 20 Books = 20S

=> Profit = 20S - 20C  

Profit = Selling Price of 2 Books = 2S

=> 20S - 20C = 2S

=> 18S = 20C

=>  9S = 10C

=>  S = 10C/9

Profit = S - C  = 10C/9  - C  =  C/9

Profit % =  (C/9)/C  * 100  = 100/9 %  =  11.11 %

Answer 2

Answer:

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