Ex 7.2, 6 - Chapter 7 Class 7 Comparing Quantities

Last updated at Dec. 16, 2024 by

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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 – SP CP = SP + Loss CP = 13,500 + Loss Loss percentage = πΏπ‘œπ‘ π‘ /𝐢𝑃 Γ— 100% 20 = 𝑳𝒐𝒔𝒔/(πŸπŸ‘πŸ“πŸŽπŸŽ + 𝑳𝒐𝒔𝒔) Γ— 100 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 = πŸπŸ‘πŸ“πŸŽπŸŽ/πŸ’ 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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo