A shopkeeper gives one kite free on sale of 19 kites if he double the discount, How many kites he will give on sale of 27 kites?

1 A shopkeeper gives one kite free on sale of 19 kites if he double the discount, How many kites he will give on sale of 27 kites?
Ans 3 kites

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question
A shopkeeper sells a badminton  racket , whose marked price is Rs. 30, at a discount of 15% and gives a shuttle cock costing Rs. 1.50 free  with each racket . Even hem he making a profit of 20% . His cost per racket is