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The urgent problem of mathematics in senior one: a certain brand of clothes will be sold at a discount in the mall because of the change of season. ...
Suppose the cost price is X yuan and the price is Y yuan:
x-0.6y= 10
0.75y-x=50
Solve the equation: x=250 y=400
250/400=62.5%
A: The cost price is 250 and the bid price is 400. If you want to lose money, you must not be less than 6.25 fold.