Question

The selling price of 10 books is equal to the cost price of 11 books. What is
the gain...​

Answer 1

Answer:

the profit or gain is 1 book or 8%

Answer 2

Given

Selling price of 10 books is equal to the cost price of 11 books.

To Find

Gain per cent

$\sf\huge\bold{\underline{\underline{{Solution}}}}$

Let assume Cost price of each book be ₹1

then Cost price of 10 books=₹10

selling price of 10 books=₹11

So,then it's a profit here , because SP is greater than CP.

Profit =Selling price-cost price

profit=11-10=1

$\sf \: gain \% = \bigg ( \dfrac{gain \times 100}{cp} \bigg )$

$\sf \: gain \% = \bigg ( \dfrac{1 \times 100}{10} \bigg ) = 10 \%$

Extra information=>

=>The cost at which an articles is purchased is called its cost price (CP)

=>The cost at which an articles sold is called its selling price (SP).

⋆If SP is greater than CP then it is profit or gain.

⋆If CP is greater than SP then it is loss.

IMPORTANT FORMULAE

Gain = (S.P.) - (C.P.)

Loss = (C.P.) - (S.P.)

$\sf\large CP = \bigg [\dfrac{100}{(100 + Gain\%)} \bigg]\times SP$

$\sf\large SP=\bigg[\dfrac{(100+Gain\%)}{100}\times CP\bigg]$