The
cost per contact (in paise) is given in matrix A as
A = 
40
Telephone
100
Housecall
50
Letter
Cost per contact









The number of contacts of each type made in two cities X and Y is given by
Telephone
Housecall
Letter
1000
500
5000
X
B
Y
3000
1000 10,000
→


= 
→

 Find the total amount spent by the group in the two
cities X and Y Rationalised 2023-24
 58
MATHEMATICS
Solution We have
BA =
40,000
50,000
250,000
X
Y
120,000 +100,000 +500,000
+
+
→



 →


=
340,000
X
Y
720,000
→



 →


So the total amount spent by the group in the two cities is 340,000 paise and
720,000 paise, i e