The cost of 4 dozen pencils, 3 dozen pens and 2 dozen erasers is Rs. 60.
The cost of 2 dozen pencils, 4 dozen pens and 6 dozen erasers is Rs. 90 whereas the cost of 6 dozen pencils, 2 dozen pens and 3 dozen erasers is Rs. 70. Find the cost of each item per dozen by using matrices.

Explanation

To solve the problem using matrices, we will first set up the equations based on the information given in the question.

### Step 1: Set up the equations
Let:
- \( x \) = cost of one dozen pencils
- \( y \) = cost of one dozen pens
- \( z \) = cost of one dozen erasers

...