Question
A shopkeeper has 3 varieties of pens A,B and C. Meenu purchased 1 pen of each variety for a total of Rs. 21. Jeen purchased 4 pens of A variety, 3 pens of B variety and 2 pens of C variety for Rs. 60. While Shikha purchased 6 pens of A variety, 2 pens of B variety and 3 pens of C variety for Rs. 70. Using matrix method find the cost of each pen.