Question

the cost price of 10 articles is equal to the selling price of 9 articles find the profit percent

Answer 1

Let Cp=x
SP=y

ATQ

10x=9y
x=9y/10

Profit=(y-x)10=y
Profit%=10y/9y*100=1000/9%

Answer 2

Let the cost price of 1 article = x.

Then the cost price of 10 articles = 10x.

Let the selling price of 1 article = y.

Then the selling price of 9 articles = 9y.

Now,

Given that Cost price of 10 articles = Selling price of 9 articles.

= > 10x = 9y

= > y = (10x/9).

We know that % = (Selling price - Cost price/(cost price)) * 100

= > (10x - 9x)/9 * 100

= > (x/9x) * 100

= > 100/9

= > 11 1/9%.

Hope this helps!