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  1. Chapter 8 Class 7 Comparing Quantities
  2. Serial order wise
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Example 19 Selling price of a toy car is Rs 540. If the profit made by shopkeeper is 20%, what is the cost price of this toy? S.P = Rs 540 C.P = ? Profit percentage = 20% Now, Profit = S.P โˆ’ C.P Profit = 540 โˆ’ C.P Also, Profit percentage = 20% ๐‘ƒ๐‘Ÿ๐‘œ๐‘“๐‘–๐‘ก/(๐ถ.๐‘ƒ) ร— 100% = 20% (540 โˆ’ ๐ถ.๐‘ƒ)/(๐ถ.๐‘ƒ) = (20%)/(100%) (540 โˆ’ ๐ถ.๐‘ƒ)/(๐ถ.๐‘ƒ) = 20/100 (540 โˆ’ ๐ถ.๐‘ƒ)/(๐ถ.๐‘ƒ) = 2/10 (540 โˆ’ ๐ถ.๐‘ƒ)/(๐ถ.๐‘ƒ) = 1/5 Cross Multiplying 5 ร— (540 โˆ’ CP) = 1 ร— CP 2700 โ€“ 5 CP = CP 2700 = 6CP 6CP = 2700 CP = 2700/6 CP = 900/2 CP = Rs 450 So, Cost Price is Rs 450

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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.