Question

which was
Que A person sold
a book for Rs 21 and got
a loss %
numerically equal to the cost.
Price
what is the cost of book​

Answer 1

Answer:

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Step-by-step explanation:

Answer 2

Step-by-step explanation:

$\blue{\underline{solution : - }}$

Let,

$\bold{ \: c.p = x}$

we know that,

$\boxed{\it{\huge{\green{c.p - s.p = loos}}}}$

Now,

$\implies{x - 21 = x \times \frac{x}{100}}$

$\implies{x - 21 = \frac{ {x}^{2} }{100}}$

$\implies{100x - 2100 = {x}^{2}}$

$\implies{ {x}^{2} - 70x - 30x + 2100 = 0}$

$\implies{x(x - 70) - 30(x - 70) = 0}$

NOW,

$\blue {\longrightarrow}$

$\implies{\green{x = 70} \: \: and \implies{\orange{x = 30}}}$

∴Real cost of book is = 70/- OR. 30/-