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In a legislative assembly election, a p...

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`Cos tp e rcon t a c t . Number of contacts of each type made in two cities X and Y is given by matrix B. Find total amount spent by group in two cities X and Y .

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Total amount`=sum_(types)`(cost per contact).(no.of contacts)
cost per contact`=A`
no.of contacts`=B`
Total amount`=B.A`
`=[[1000,500,5000],[3000,1000,10000]][[40],[100],[50]]`
`=[[40000+50000+250000],[120000+100000+500000]]`
`=[[340000],[720000]]`
`340000=X,720000=Y`
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