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Question
After allowing a discount of 12% on the marked price, a shopkeeper still gains 21%. The marked price is above the cost price by
Options:
A .  42.5%
B .  37.5%
C .  25%
D .  30%
Answer: Option B
Answer: (b)C.P. of article = Rs.100Marked price be x${x × 88}/100$ = 121$x = {121 × 100}/88$ = Rs.137.5i.e. 37.5% above C.P.Using Rule 9,Here, r = 12%, R = 21%Required percentage= $({r + R}/{100 - r} × 100)$%= $({12 + 21}/{100 - 12}) × 100%$= $33/88 × 100%$= $3/8 × 100$= $300/8$% = 37.5%

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