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[" By selling "90" ball pens for Rs "160" a person "],[" loses "20%" How many ball pens should be "],[" sold for Rs "96" so as to have a profit of "20%?],[" Solution: "],[" S.P of "90" ball pens = Rs."160],[" Loss "=20%],[" Therefore,C.P "=SP((100)/(100-105s))_(0)],[CP=(100)/(100-20)times160]

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