A merchant sold an article at a loss of 10%. If the selling price had been increased by Rs. 45,there would have been a gain of 5%. What was the cost price of the article?
Solution: Let C.P. be Rs. X. then, (105% of x) - (90% of x) = 45 or 15% of x =45.
.'. 3x/20 = 45
=> x = 15*20 = Rs. 300
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