Question

find c.p. if s.p. is ₹390 and loss percent is 20%
Please give detailed answer I need it​

Answer 1

Step-by-step explanation:

On finding sp when cp and profit or loss percent are given

In this method you can use proportion or formula.

If Profit % is given then selling price will be

CP (100 + P%)

SP = ------------------

100

To find SP when loss % and CP are given

CP (100 - L%)

SP = ------------------

100

Answer 2

$\bold { \red{EXPLANATION:}}$

GIVEN :

S.P = Rs 390

Loss = 20%

TO FIND :

C.P = ?

SOLUTION :

Let C.P be x

$∴ S.P\: for\: loss \: 20\%= \frac{80x}{100}$

$\implies \frac{80x}{100} = 390$

$\implies \: 80x = 390 \times 100$

$\implies \: 80x = 39000$

$\implies \: x = \frac{39000}{80}$

$\implies \: x = 487.5$

$\therefore \: C.P = 487.5 \:RS$