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Question
By selling an article for Rs.900; a man gains 20%. Find his cost price and the gain.
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Solution
S.P. of an article = Rs.900
Gain = 20%
C.P. =`100/((100+"Gain"%))xx"S.P."`
∴ C.P. =`100/((100+20))xx"Rs."900`
= Rs.`100/120xx900`
= Rs.`9000/12`
Gain = S.P. − C.P.
= Rs.900 − Rs.750
= Rs.150
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