Question

On selling 21 books for 1600rs, the seller earns a profit of 5 books. Find the cost price of 1 book.

Answer 1

Answer:

Let the cost of one book be x

then

A/Q

21x+5x = 1600

26x = 1600

x = 1600/26 = 61.5 Rs.

then cost of one book = 61.5 rs

Hope it helps....

Answer 2

Given:

The selling price (SP) of 21 books = 61 Rs.

Earn profit from 5 books.

To Find:

Cost price (CP) of 1 book = ?

Solution:

Let the cost price of 1 book be "x".

then,

According to the question,

⇒  $21x+5x=1600$

⇒  $26x=1600$

⇒  $x=\frac{1600}{26}$

⇒  $x=61.5 \ Rs.$

Thus, the CP of 1 book will be "61.5 Rs.".