Question

if the cost price of 20 books is equal to cost of 18 books find the gain or loss percent ​

Answer 1

Answer:

11.11%

Step-by-step explanation:

The Cost price of 20 books = selling price of 18 books

So cost price of one book = 9/10 selling price of one book

Selling price = 10/9 Cost price

Profit is obtained because cost price is less than selling price

Profit = SP - CP = 10/9CP - CP = 1/9 CP

Profit percent = profit / CP x 100

                      = [{(1/9) CP }/ CP] x 100

                      = 1/9 x 100 = 100/9

                      = 11.11%

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