Q. 15

# By selling 90 bal

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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