Answer :

Selling price of 90 ball pens = Rs. 160


Selling price of 1 ball pen = Rs.


Loss% = 20%


Let cost price of 1 pen = Rs. X


So,


=


Cost price of 1 ball pen = Rs.


To get profit of 20%...


Let no.of pens = x


Selling price of x pens = Rs. 96


Selling price of 1 pen = Rs.


By formula ,


=


= 20 =


=


= x = 36


Hence,


Number of ball pens can be purchased = 36.


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