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.

The cost of 4 pencils, 3 pens and 2 books is Rs.150. The cost of 1 pencil, 2 pens and 3 books is Rs.125.The cost of 6 pencils , 2 pens and 3 books is Rs. 175. Find the cost of each item by using matrices.

3 pencils and 4 pens cost Rs. 270 while 4 pencils and 3 pens cost Rs. 150 . Find the combined cost of one pencil and one pen.

If the cost of bananas is increased by rupees 10 per dozen, one can get 3 dozen less for rupees 600. Find the original cost of one dozen of bananas.

The total cost of 8 books and 5 pens is Rs 420 and the total cost of 5 books and 8 pens is Rs 321. Find the cost of 1 book and 2 pens.

The sum of the costs of one book each of Mathematics, Physics and Chemistry is Rs 210. Total cost of a mathematics book, 2 physics books, and a chemistry book is Rs. 240/- Also the total cost of a Mathematics book, 3 physics book and 2 chemistry books is Rs. 300/-. Find the cost of each book using matrices.

3 books and 10 pens together cost Rs 300. 2 books and 3 pens together cost Rs 145. Find the cost of 1 book and 3 pens.