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10℅ of 600=
10/100×600=
60 rs loss .
then add 60 rs into 600 rs .
profit = 20℅ of 660
= 20/100×660
= 132rs . needed
10/100×600=
60 rs loss .
then add 60 rs into 600 rs .
profit = 20℅ of 660
= 20/100×660
= 132rs . needed
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