Three shopkeepers A, B, C go to a store to buy stationery. A purchases 12 dozen note books, 5 dozen pens and 6 dozen pencils. B purchases 10 dozen note books, 6 dozen pens and 7 dozen pencils. C purchases 11 dozen note books, 13 dozen pens and 8 dozen pencils. A note book costs 40 paise, a pen Rs. 1:25 and a pencil costs 35 paise. Use matrix multiplication to calculate each individual bill.
(12 5 6)...(40)
(10 6 7)...(125) =
(11 13 8)..(35)
(1315)
(1395)
(2345}
Since everything was bought in dozens, multiply those numbers by 12