In a local election, a group hired a public relations firm to promote its candid

Question

In a local election, a group hired a public relations firm to promote its candidate in three ways: telephone calls, house calls, and letters. The cost per contact is given in the matrix M, and the number of contacts of each type made in two adjacent cities is given in matrix N. Complete parts A and B below.
Cost per contact Telephone house
$1.00 Telephone Call 1,200 600 6,000 City A
M= $2.80 House Call N= 2,400 800 6,000 City B
$1.30 Letter
(A) Find the total amount spent in City A.
(B) Find the total amount spent in City B.

Explanation / Answer

given that,
cost per telephone call=$1.00
cost per house call=$2.80
cost per letter=$1.30
this implies
M=[1 2.80 1.30]
again,

telephon house letter

city A 1,200 600 6,000

city B 2,400 800 6,000

from the above datas we can directly get that,

total amount spent in city A=(1200*1.00)+(600*2.80)+(6000*1.30)=$10680

total amount spent in city A=(2400*1.00)+(800*2.80)+(6000*1.30)=$12440

The total amount spent in city A is $10680 & in city B is $12440.

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