Question

A boy sold his book for 64 ruppes at 20% loss.What was the cost price of the book?
​

Answer 1

Answer:

Cost price of the book is Rs. 80

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 = 8 CP

CP = 640/8

Therefore CP = 80

So the Cost price of the book is is Rs. 80

HOPE IT HELPS, MATE!

Answer 2

Let,cost price=x

x-20x/100=64

=>80x/100=64

=>4x/5=64

=>4x=320

or,x=80

80 rupees was the cost price of the book