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Question
A shopkeeper offers 10% discount on the marked price of his articles and still makes a profit of 20%. What is the actual cost of the article marked Rs.500 for him ?
Options:
A .  Rs.375
B .  Rs.400
C .  Rs.440
D .  Rs.425
Answer: Option A
Answer: (a)Let the cost price of article be x$500 × 90/100 = 120/100 × x$450 = ${6x}/5$$x = {450 × 5}/6$ = Rs.375Using Rule 6,C.P. = ? , M.P. = Rs.500, r = 20%, D = 10%$\text"MP"/\text"CP" = {100 + r}/{100 - D}$$500/\text"CP" = {100 + 20}/{100 - 10}$C.P.= ${500 × 90}/120$ = Rs.375

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