
A tradesman gives 4% discount on the marked price and gives 1 article free for buying every 15 articles and thus gains 35%. The marked price is increased above the cost price by

 40%
 39%
 50%
 20%
Correct Option: C
Let the C.P. of each article be ₹ 1
For 15 books, the tradesman gives 1 book free.
∴ C.P. of 15 books = ₹ 16
gains = 35%
∴ S.P. of 15 books = 16 ×  = ₹  
100  5 
∴ S.P. of 15 book =  = ₹  
5 × 15  25 
Now, 96% of marked price =  
25 
∴ Marked price =  =  = ₹ 1.5  
25 × 96  2 
Total increase = 1.5  1 = ₹ 0.5
∴ The required % increase =  × 100 = 50%  
1 