# Example 19 - Chapter 8 Class 7 Comparing Quantities

Last updated at Nov. 6, 2018 by Teachoo

Last updated at Nov. 6, 2018 by Teachoo

Transcript

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 โ C.P Profit = 540 โ C.P Also, Profit percentage = 20% ๐๐๐๐๐๐ก/(๐ถ.๐) ร 100% = 20% (540 โ ๐ถ.๐)/(๐ถ.๐) = (20%)/(100%) (540 โ ๐ถ.๐)/(๐ถ.๐) = 20/100 (540 โ ๐ถ.๐)/(๐ถ.๐) = 2/10 (540 โ ๐ถ.๐)/(๐ถ.๐) = 1/5 Cross Multiplying 5 ร (540 โ 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

Examples

Example 1

Example 2

Example 3

Example 4 Important

Example 5

Example 6 Important

Example 7

Example 8

Example 9

Example 10 (a) Important

Example 10 (b)

Example 10 (c)

Example 11 Important

Example 12

Example 13

Example 14

Example 15 Important

Example 16

Example 17

Example 18 Important

Example 19 Important You are here

Example 20

Example 21 Important

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.