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  1. Chapter 8 Class 7 Comparing Quantities
  2. Serial order wise
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Ex 8.3, 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 – SP CP = SP + Loss CP = 13,500 + Loss …(1) Loss percentage = πΏπ‘œπ‘ π‘ /𝐢𝑃 Γ— 100% 20% = πΏπ‘œπ‘ π‘ /(13500 + πΏπ‘œπ‘ π‘ ) Γ— 100% (20%)/(100%) = πΏπ‘œπ‘ π‘ /(13500 + πΏπ‘œπ‘ π‘ ) 20/100 = πΏπ‘œπ‘ π‘ /(13500 + πΏπ‘œπ‘ π‘ ) 2/10 = πΏπ‘œπ‘ π‘ /(13500 +πΏπ‘œπ‘ π‘ ) 1/5 = πΏπ‘œπ‘ π‘ /(13500 +πΏπ‘œπ‘ π‘ ) Cross Multiplying 1 Γ— (13500 + Loss) = 5 Γ— Loss 13500 + Loss = 5 Loss 5 Loss = 13500 + loss 5 Loss βˆ’ 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

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.