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Question
A vendor bought 120 sweets at 20 p each. In his house, 18 were consumed and he sold the remaining at 30 p each. Find his profit or loss as percent.
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Solution
Quantity of sweets bought = 120
∴ C.P. of 120 sweets `=(120 xx 20)/100` = Rs. 24
No. of sweets consumed = 18
Balance sweets = 120 - 18 = 102
∴ S.P. of 102 sweets
`= (102 xx 30)/100 = 3060/100` = Rs. 30.60
Gain = S.P. - C.P.
= Rs. 30.60 - Rs. 24 = Rs. 6.60
Gain % = `("gain" xx 100)/"C.P"`
`= (6.60 xx 100)/24`
`= (660 xx 100)/(100 xx 24) = 55/2 = 27.5 %`
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