Question

A boy sold his old book for 64 at 20% loss. What was the cost price of
the book
(A) 78.80 (B) 80 (C) 3 100 (D) 3 120​

Answer 1

Answer = 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=8CP

cost price is Rs. 80

Hope it helps you