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Example 19 - In a legislative assembly election, a political - Examples

Example 19 - Chapter 3 Class 12 Matrices - Part 2
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Example 19 In a legislative assembly election, a political group hired a public relations firm to promote its candidate in three ways: telephone, house calls, and letters. The cost per contact (in paise) is given in matrix A as A = [■8( 40 @[email protected])] The number of contacts of each type made in two cities X and Y is given by B = [■8(1000& 500 &[email protected]&1000&10,000)] Find the total amount spent by the group in the two cities X and Y. We need to calculate total amount spent by the group in two cities x & y Total amount spent = Number of contact × Cost per contact = BA = [■8(1000&500&[email protected]&1000&10,000)]_(2 × 3) [■8([email protected]@50)]_(3 × 1) = [█(1000(40)+500(100)+5000(50)@3000(40)+1000(100)+10,000(50))]_(2 × 1) = [█(40,000+50,000+250,[email protected],000+100,000+500,000)] = [█(340,[email protected],000)] Hence, total amount spent = [█(340,[email protected],000)] So the total amount spent by the group in city X = 340,000 paise = Rs. 3400 So the total amount spent by the group in city X = 720,000 paise = Rs. 7200

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.