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Question
A manufacturer marked an article at Rs.50 and sold it allowing 20% discount. If his profit was 25%, then the cost price of the article was
Options:
A .  Rs.30
B .  Rs.32
C .  Rs.40
D .  Rs.35
Answer: Option B
Answer: (b)Marked price = Rs.50S.P. after discount = 80% of 50 = Rs.40If the CP of article be x, then${125 × x}/100 = 40$$x = {40 × 100}/125$ = Rs.32Using Rule 6,Here, M.P. = Rs.50, C.P. = ?,r = 25%, D = 20%$\text"MP"/\text"CP" = {100 + r}/{100 - D}$$50/\text"CP" = {100 + 25}/{100 - 20}$C.P.= ${50 × 80}/125$ = Rs.32

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