Question

a boy sells 10 pens for rupees 100, gaining 25%. how many pens did he buy for rupees 120​

Answer 1

Ans. Therefore, pans he bought for 120₹ =120/8=15

Answer 2

Answer:

Step-by-step explanation

if he sold 10 pens for Rs 100

then 1 pen= 100/10 Rs.

now that you got 1 pen cost, i.e. Rs 10

and you know Cost price + gain% of cost price= Sp.

I.e. CP + 25/100 OF CP= 10

=CP (1+25/100)=10        =CP(125/100)=SP =10  

=====================CP=100/125 X 10= 1000/125=  40/5=8RS

THEN NO OF PENS HE BOUGHT = 120/8= 30/2== 15 PENS