By selling an article at 20%. discount. a shopkeeper gains 25%. If the selling price of the article is Rs. 1.440; find: (i) the marked price of the article. (ii) the cost price of the article.
S.P. of the article = Rs.1440
Let marked price = Rs. 100x
Discount = 20%
∴ S.P. = 100x(100−20)100=80x
According to statement, 80x = 1440
x=144080⇒x=18
∴ x = 18
∴ Marked price = 100x = 100 × 18 = Rs.1800
S.P. = Rs.1440
Profit = 25 %
∴ C.P.= 100×S.P.100+25=100×1440125=45×1440
= 4 × 288= Rs.1152