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prealgebra intermediate

Problem

A merchant placed on display some dresses, each with a marked price. He then posted a sign ' off on these dresses.' The cost of the dresses was of the price at which he actually sold them. Then the ratio of the cost to the marked price was:
(A)
(B)
(C)
(D)
Solution
Let be the marked price. Then would be the selling price of the dresses. The cost of the dresses was of the selling price, or . So the ratio of the cost to the marked price is , or .
Final answer
A