Question

by selling a book for ₹25 and raj gain 25% find the cost. tell step by step​

Answer 1

using formula CP = ( SP * 100 ) / ( 100 + percentage profit).

selling price is 25 percentage given 25% no selling price into hundred divide by hundred plus percentage

Answer 2

₹20

Step-by-step explanation:

Q.

By selling a book for ₹25 and Raj gain 25% find the cost.

Solution -

Let the cost as x,

so

cost + gain = selling price

$= > x + 25\% = 25 \\ \\ = > x + x \times 25\% = 25 \\ \\ = > x + x \times \frac{25}{100} = 25 \\ \\ = > x + x \times 0.25 = 25 \\ \\ = > x + 0.25x = 25 \\ \\ = > 1.25x = 25 \\ \\ = > x = \frac{25}{1.25} \times \frac{100}{100} = \frac{2500}{125} = 20$

Hence the cost price = ₹20

hope it helps.