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  1. Chapter 8 Class 7 Comparing Quantities
  2. Serial order wise
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Ex 8.3, 3 The population of a city decreased from 25,000 to 24,500. Find the percentage decrease. Initial population = 25,000 Final population = 24,500 Decrease in population = Initial population βˆ’ Final population = 25,000, βˆ’ 24, 500 = 500 Percentage decrease in population = (π·π‘’π‘π‘Ÿπ‘’π‘Žπ‘ π‘’ 𝑖𝑛 π‘π‘œπ‘π‘’π‘™π‘Žπ‘‘π‘–π‘œπ‘›)/(πΌπ‘›π‘–π‘‘π‘–π‘Žπ‘™ π‘π‘œπ‘π‘’π‘™π‘Žπ‘‘π‘–π‘œπ‘›) Γ— 100% = 500/25,000 Γ— 100% = 5/250 Γ— 100% = 5/25 Γ— 10% = 1/5 Γ— 10% = 2%

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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.