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  1. 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
    1. 40%
    2. 39%
    3. 50%
    4. 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 ×
135
= ₹
108
1005

∴   S.P. of 15 book =
108
= ₹
36
5 × 1525

Now, 96% of marked price =
36
25

∴   Marked price =
36 × 100
=
3
= ₹ 1.5
25 × 962

Total increase = 1.5 - 1 = ₹ 0.5
∴ The required % increase =
0.5
× 100 = 50%
1


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