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Question
A certain number of articles are bought at 3 for Rs. 150 and all of them are sold at 4 for Rs. 180. Find the loss or gain as percent.
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Solution
L.C.M. of 3 and 4 = 12
Let 12 articles are brought
∴ C.P. of 12 articles = Rs. `(150 xx 12)/3` = Rs. 600
and S,P, of 12 articles = Rs. `(180 xx 12)/4` = Rs. 540
Loss = C.P. - S.P.
= Rs. 600 - Rs. 540 = Rs. 60
Loss % =`("Loss" xx 100)/"C.P." = (60 xx 100)/600 = 10%`
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