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the guest was me....sorry i forget to login always..
there is a shortcut to approach these type of problems too..
If the CP of x articles is equal to the selling price of y articles, then if y is less than x, the retailer makes a profit and the profit % is [(x-y)/y]*100.
And, if y is greater than x, then the retailer makes a loss and the loss % is [(y-x)/y]*100