Question

a boy sold his old book for rupees 64 at 20% loss. what was the cost price of the book?

Answer 1

Answer:

Step-by-step explanation:

Selling price is=64

Loss=20%

Cost price=?

We know that

Loss=Cost Price-Selling Price

Loss in %=[(Cost price-Selling price)/Cost price]*100%

20=[(CP-64)/CP]*100

20CP=100CP-6400;

640=8Cp

Cost price is Rs. 80

Answer 2

SP=rs64
Loss%=20%
CP=100×SP/100-L%
=100×64/100-20
=100×64/80
=rs80
So,CP=rs80