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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
Options:
A .  39%
B .  40%
C .  20%
D .  50%
Answer: Option D
Answer: (d)Let the C.P. of each article be Rs.1For 15 books, the tradesman gives 1 book free.C.P. of 15 books = Rs.16S.P. of 15 books= $16 × 135/100$ = Rs.$108/5$S.P. of 1 book= $108/{5 × 15}$ = Rs.$36/25$Now, 96% of marked price = $36/25$Marked price= ${36 × 100}/{25 × 96} = 3/2 = Rs.1.5$The required % increase= ${0.5}/1 × 100$ = 50%

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