A shopkeeper sold an article at a gain of 5percent. If he sold it for Rs 16.50less, he would have lost 5percent. Find the cost price of the article.
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Let CP be x. P%=5
SP=(1+p/100)×cp
SP=105/100× X
SP=21x/20
CP=x. L%=5
SP=(1-L/100)×cp
SP=95/100× X
SP=19x/20
Given. 21x/20-16.5=19x/20
2x/20=16.5
2x=330
X=165
Therefore CP is165
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