Question

The selling price of article is Rs 39. If numeri
value of profit percent is equal to cost price then
find the cost price of the article.​

Answer 1

Answer:

c.p rs 30 also pt%is 30

Step-by-step explanation:

30+9=39 s.p

Answer 2

Cost price of article is Rs 30.

Step-by-step explanation:

Let the cost price of the article is Rs x.

Then Profit percent =  x%

The formula for cost price is given by

$CP=\frac{SP}{100+Profit\%}\times100$

Substituting the known values

$x=\frac{39}{100+x}\times100$

Cross multiplying, we get

$100x+x^2=3900\\\\x^2+100x-3900=0$

Solve the equation for x by middle term splitting

$x^2+130x-30x-3900=0\\\\x(x+130)-30(x+130)=0\\\\(x+130)(x-30)=0\\\\x=-130,30$

Cost price cannot be negative.

Thus, the cost price of article is Rs 30.

#Learn More:

How to find profit percentage? ​

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