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 then he makes a profit of 20%. His cost price per racket is :  Pick
A) 23.5
B) 22.5
C) 21.0
D) 20.0
E) None
Sol.   Marked price = Rs. 30. S.P. = Rs.[(85/100 * 30) - 1.50] = Rs. (25.50 - 1.50) = Rs. 24.   Let C.P. be Rs. x Then, 120% of x = 24 ⇒ x (24 * 100 / 120) = Rs. 20.   Answer 20.0
<result>D</result>
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 then he makes a profit of 20%. His cost price per racket is :