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.

Explanation

To solve the problem of calculating the individual bills of shopkeepers A, B, and C using matrix multiplication, we will follow these steps:

### Step 1: Define the Purchases Matrix
We first need to create a matrix that represents the quantities of items purchased by each shopkeeper.

Let:
- A's purchases: 12 dozen notebooks, 5 dozen pens, 6 dozen pencils
- B's purchases: 10 dozen notebooks, 6 dozen pens, 7 dozen pencils
...