Question

A dealer sells an article for Rs.39 and gains as much percent as the cost price
of the article. Find the cost price of the article.​

Answer 1

Answer:

30

Step-by-step explanation:

Let cp be x

Sp=39

Gain = 39-x

Gain%= (39-x*100)/x

Gain%=3900-100x/x

Gain%=cost price

So gain %=x

So 3900-100x/x=x

So x^2+100x-3900

x^2+130x-30x-3900

=x(x+130)-30(x+130)

So x=30

Cost price is 30