By selling

By selling an article for $21, a trader loses a percentage equal to the cost price of the article. Find the cost price.

Final Answer:

x1 =  70 USD
x2 =  30 USD

Step-by-step explanation:




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You need to know the following knowledge to solve this word math problem:

algebrabasic operations and conceptsUnits of physical quantitiesGrade of the word problem

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