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Three shopkeepers A ,\ B\ a n d\ C go to...

Three shopkeepers `A ,\ B\ a n d\ C` go to a store to buy stationary. `A` purchases 12 dozen notebooks, 5 dozen pens and 6 dozen pencils. `B` purchases 10 dozen notebooks, 6 dozen pens and 7 dozen pencils. `C` purchases 11 dozen notebooks, 13 dozen pens and 8 dozen pencils. A notebook costs 40 paise, a pen costs Rs. 1.25 and a pencil costs 35 paise. Use matrix multiplication to calculate each individuals bill.

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