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Cost price, selling price, profit % , loss%

Chapter 7 Class 7 Comparing Quantities

Concept wise

Last updated at May 29, 2023 by Teachoo

Ex 7.2, 6 Juhi sells a washing machine for Rs 13,500. She loses 20% in the bargain. What was the price at which she bought it? S.P = Rs 13,500 C.P = ? Loss Percentage = 20% Now, Loss = CP โ SP CP = SP + Loss CP = 13,500 + Loss โฆ(1) Loss percentage = ๐ฟ๐๐ ๐ /๐ถ๐ ร 100% 20% = ๐ฟ๐๐ ๐ /(13500 + ๐ฟ๐๐ ๐ ) ร 100% (20%)/(100%) = ๐ฟ๐๐ ๐ /(13500 + ๐ฟ๐๐ ๐ ) 20/100 = ๐ฟ๐๐ ๐ /(13500 + ๐ฟ๐๐ ๐ ) 2/10 = ๐ฟ๐๐ ๐ /(13500 +๐ฟ๐๐ ๐ ) 1/5 = ๐ฟ๐๐ ๐ /(13500 +๐ฟ๐๐ ๐ ) Cross Multiplying 1 ร (13500 + Loss) = 5 ร Loss 13500 + Loss = 5 Loss 5 Loss = 13500 + loss 5 Loss โ loss = 13500 4 Loss = 13500 Loss = 13500/4 Loss = Rs 3375 From (1) C.P = 13500 + 3375 = Rs 16875 So, she bought it at Rs 16,875