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  1. Chapter 8 Class 7 Comparing Quantities
  2. Serial order wise
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Example 18 The number of illiterate persons in a country decreased from 150 lakhs to 100 lakhs in 10 years. What is the percentage of decrease? C.P = Rs 120 S.P = ? Loss percentage = 10% πΏπ‘œπ‘ π‘ /(𝐢.𝑃) Γ— 100% = 10% πΏπ‘œπ‘ π‘ /120 = (10%)/(100%) πΏπ‘œπ‘ π‘ /120 = (10%)/(100%) Loss = 10/100 Γ— 120 Loss = 1/10 Γ— 120 Loss = Rs 12 Now, Loss = CP βˆ’ SP SP = CP βˆ’ Loss = Rs (120 βˆ’ 12) = Rs 108 It is sold Rs 108

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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.