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Example 18 - The cost of a flower vase is Rs 120. If the shopkeeper

Example 18 - Chapter 8 Class 7 Comparing Quantities - Part 2

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Transcript

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 is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.